Renamed 'Session' to 'UserSession'. Changed JSON date
Merge remote-tracking branch 'origin/after_review' into after_review

Conflicts:
	src/main/java/ru/pmsoft/twitterkiller/domain/entity/Tweet.java
	src/main/java/ru/pmsoft/twitterkiller/domain/entity/UserSession.java
	src/main/resources/Session.xml
	src/main/resources/Tweet.xml