Prepare for Google appcloud
Update maven plugin version
Moved to servlet 3.0 / jsp 2.2
Changed web.xml to servlet 3.0 xsd
Refactor of webjsp part, code cleanup
Merge branch 'master' into minimal

Conflicts:
	README.md
	core/pom.xml
	pom.xml
	webjsp/pom.xml
	webjsp/src/test/selenium/vrampal/connectfour/selenium/MainPageTest.java