Cleaner invalid states, file upload field

• Clarified how to define explicitly invalid fields
• JS to help highlight invalid fields only after initial interaction
• File upload field CSS

Improve form fields

• Account for all field-group combinations, bare, split, etc.
• Auto-expand selects inside fields per user expectations

Fine-tune responsive forms

• Form inputs had too much padding for fine pointer environments.
• Made .vp-group cooperate well with .vp-field siblings.

Minor update

Clean up a few form-related details.

Minor update

New:

• Inject pattern attribute to input[type=email] elements to add a conservative layer to the browsers' anemic validation.

Bug fixes:

• Add 4px to auto-growing <textarea/> like the inputs to avoid flickering scrollbars

Namespace colors

Bug fixes:

• Stop leaking colors, boxes and backgrounds outside of .vp

Namespace clean-up

Breaking changes:

• .vp-note and .vp-msg became custom element <vp-note/>
• Self-describing classes like colors dropped their vp- prefix
• Tabs became proper custom element <vp-tabs/>
• .vp-box renamed .vp-wrap for clarity

Other changes:

• Makefile: improved clean rule
• README: added GitHub release version shield

Initial release

With this release, we have the core CSS and JS libraries needed for basic use of colors, grids, forms, tables, tabs and messages. Components will build on top of that foundation.

Prototype 3

• Fully documented
• JS library mostly complete
• Components structure is stabilizing
• Editeur component fully usable
• CSS not yet refactored