[LPS-37920][LPS-37433] Fix for Incorrect scanline stride PNG issue

http://issues.liferay.com/browse/LPS-37433
LPS-26027 Required double logon
LPS-21850 Apache TomEE compatibility

Tomee bundle configuration for ant
Update vaadin version to 6.8.12
LPS-33794 extend_session.jsp cannot invoke servlet for Vaadin portlet
Merge pull request #5 from paulbutenko/6.1.1-ga2-patched

Update vaadin version to 6.8.12
Adding build-date to every build from now on