fix javadoc errors found by OpenJDK 7
introduce testing API to call EssentialAction
Merge pull request #2085 from yanns/javadoc

fix javadoc errors found by OpenJDK 7
Merge pull request #2086 from yanns/2011-essential-action-testing-API

introduce testing API to call EssentialAction
Fix code samples

Conflicts:
	framework/src/play/src/main/java/play/libs/F.java