fix: add created type PullRequestReviewEvent

[CoderYellow]

Fix crash when showing user's activity in some case, related issue #368.

For example, showing this guy's activity will cause this error:

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.thirtydegreesray.openhub, PID: 23960
    java.lang.IllegalArgumentException: No enum constant com.thirtydegreesray.openhub.mvp.model.EventPayload.PullRequestReviewEventActionType.created
        at java.lang.Enum.valueOf(Enum.java:257)
        at com.thirtydegreesray.openhub.mvp.model.EventPayload$PullRequestReviewEventActionType.valueOf(EventPayload.java:40)
        at com.thirtydegreesray.openhub.ui.adapter.ActivitiesAdapter$ViewHolder.getPullRequestReviewEventStr(ActivitiesAdapter.java:266)
        at com.thirtydegreesray.openhub.ui.adapter.ActivitiesAdapter$ViewHolder.setActionAndDesc(ActivitiesAdapter.java:191)
        at com.thirtydegreesray.openhub.ui.adapter.ActivitiesAdapter.onBindViewHolder(ActivitiesAdapter.java:71)
        at com.thirtydegreesray.openhub.ui.adapter.ActivitiesAdapter.onBindViewHolder(ActivitiesAdapter.java:43)
        at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6354)
        at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6387)
        at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5343)
        at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5606)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5448)
        at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5444)
        at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2224)
        at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1551)
        at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1511)
        at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:595)
        at com.thirtydegreesray.openhub.ui.adapter.base.CatchableLinearLayoutManager.onLayoutChildren(CatchableLinearLayoutManager.java:43)
        at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3600)
        at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3329)
        at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3867)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.support.v4.widget.SwipeRefreshLayout.onLayout(SwipeRefreshLayout.java:636)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1795)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1167)
        at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:852)
        at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:871)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:131)
        at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:42)
        at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1397)
        at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:870)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:786)
        at android.view.View.layout(View.java:22105)
        at android.view.ViewGroup.layout(ViewGroup.java:6290)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3356)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2827)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1940)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8041)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1163)
        at android.view.Choreographer.doCallbacks(Choreographer.java:986)
        at android.view.Choreographer.doFrame(Choreographer.java:902)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1148)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7710)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
E/CrashReport: Java Crash Happen cause by main(2)

As you can see the error above indicates that the user events api result includes created type pull request which is not defined in PullRequestReviewEventActionType

Todo: i18n support