Fix reference to 'state' with '_state' or 'state'.
Add support for bootstrap modal sizes

  - New optional property "size" on modal creation
  - Also adds example for small modal

documentation and grunt build

rebuild post merge
Support a custom header view class in modal

Similar to the support for custom content view classes and custom
footer classes this allows for a custom header.
rename templates with underscores to use dashes
Allow radio buttons to be disabled. Closes #101.
Didn't add the dist file changes from the previous commit.
Select and multi-select now responsive to labels

When labels change value select and multi-select will now both update
both their sort order and filtering. This is accomplished by filtering
and sorting through a proxy which is updated whenever the
labelValuePath is updated.
Merge remote-tracking branch 'origin/master' into andy/tabbable-dropdowns

Conflicts:
	dist/js/ember-widgets.js
	dist/js/ember-widgets.min.js
	src/mixins.coffee