Fixed recieving messages from another recources in MUC
Fixed MUC leaving after reconnection to server

Conflicts:
	protocols/jabber/jreen
	protocols/jabber/src/protocol/account/muc/jmucmanager.cpp
Added user's avatar and senderName to conference notifications
Compile fixes and polishing for clang.
qt4 build fixes
Fixed duplication of outgouing messages in MUCs
fix qt4 build
Merge pull request #243 from Hamper/qt4

Qt4 backports