Added DropListener and DropController
Removed generic from DropContoller constructor
Removed generic from DropListenerTest
Merge pull request #76 from L-Henke/dropListener

Added DropListener and DropController
Added a check to the test

* Made TestMessage class static for gson. (stupid me).

Faking the date for compare test.
not using string check anymore

not relaying on the date anymore
using de and serialistation at one now.
removed obsolete comment
added a couple more tests
Merge pull request #75 from jan-schreib/dropserializertest

Added more checks for the drop de and serializer