make menu to support sub-menu; some api docs update
update many elements for polymer-element
move <link rel="stylesheet"> tags inside of <template>
update ui-clock and ui-toggle-button for polymer-element
merge changes from master
update clock, weather and stock for polymer-element
move uxa widgets to more-elements repo
update model in selectionChange
provide a way to align icon to the right of lable
Merge branch 'master' into polymer-element

Conflicts:
	polymer-ui-menu-item/polymer-ui-menu-item.html
	polymer-ui-menu/polymer-ui-menu.html
	polymer-ui-nav-arrow/polymer-ui-nav-arrow.html
	polymer-ui-sidebar-menu/polymer-ui-sidebar-menu.html
Merge branch 'polymer-element' of github.com:Polymer/polymer-ui-elements into polymer-element
Merge pull request #4 from Polymer/polymer-element

Switch to <polymer-element>
toolbar now just flex-layout CSS class directly
polymer-ui-splitter
toolbar: add responsive behavior
polymer-ui-icon: remove extra div that is not needed, and instead just
use the host node.
update api doc
update api doc; better css for responsive toolbar
cleanup css
polymer-ui-accordion