dz3 implemented + dz1-dz3 tests
dz4 + tests
Merge branch 'master' of https://github.com/3D-GRAF/tp_2014_02_java_kildishev

Conflicts:
	src/main/java/web/accounts/AccountService.java
	src/main/java/web/frontend/Frontend.java
	src/main/java/web/frontend/UserSession.java
	src/main/java/web/messagesystem/MessageSystem.java
	src/main/java/web/messagesystem/MsgSignUpStatus.java
	src/main/java/web/messagesystem/MsgSignUpUser.java
	src/main/java/web/server/Main.java
	test/main/java/web/accounts/AccountServiceTest.java
	test/main/java/web/selenium/FunctionalTest.java
removed unused files