Start to refactor the TAO tree.
enable actions from tree events
know if a section contains trees or actions
generate actions list only once
move components to layout
Merge branch 'acl-tree' into new-design-acl

Conflicts:
	actions/class.Main.php
	views/js/uiBootstrap.js
	views/templates/layout.tpl
Refactor actions binding
redo actions
Merge branch 'new-design-acl' into new-design

Conflicts:
	actions/class.Main.php
	views/js/uiBootstrap.js
	views/templates/main/actions.tpl
remove duplicated Action::getGroup
Also manage section's default icon
make the actions and the tree init on the new templates
Merge branch 'new-design' of git://github.com/oat-sa/tao-core into new-design

Conflicts:
	helpers/Layout.php