Add eclipse lifecycle mapping
add headers
Merge pull request #170 from ArloL/update-headers

Add headers
Merge pull request #169 from ArloL/lifecycle-mapping

Add eclipse lifecycle mapping
Fixes #168 - Adding PullMixin to ComplexWidget and AbstractTextWidget.
Fixes #159 - Adding way to add click handler to Next/Previous buttons on Pager.
Updates from the HasPull
Updating java doc for ListItem vs. AnchorListItem
Updating the AttributeMixin to have a check for attributes
Fixes #58 - Adding HasEnabled to Select