Accordion: Removal of height query hacks.
Modal: Set in-async to null instead of undefined,
As it didn't trigger property changes properly.
modal: Support for Ember-Forms within Modal

Closes #26
tree: Tree tag & hovered icon actions

Closes #23
Closes #24
Button component

Fixes #29
Tree: Multi selection & auto expand

Closes #27
Closes #28
List: on-click event if list isn't in selection mode.
Modal: Alpha background when modal is open and 'on-cancel' event.

- Alpha background when modal is open for modal highlight effect.
- Modal 'on-cancel' event when closing a not submitted modal-form.
Version 0.2.0 release.
Add action-link in wysiwyg component
Add format action in wysiwyg component
merge