add deleteMessages overload
 implement Messages.add() method, add constructor overload
Merge pull request #61 from pyeremenko/master

Add possibility to remove multiple messages
Merge branch 'master' into v3
remove method from lib-v1 after merge
modify ClientIronMQTest for v3
fix tests
Merge pull request #62 from pyeremenko/v3

Keeping v3 synchronized with master