started implementing of drop api
api encryption part done
renamed plain String; finished deserialisation
finished send part, implemented test.

json part needs a few more looks.
drop-api finished

* added javadoc to the api
* implemented api test
* added more getters and setters

Tests are on ignore for now. Will change when we got a working
drop-server running and I get the credentials (if needed).

TODO: send() is using sendAndForget() for now. Should be changed when we
have a drop ack method.
typo fix
refactored drop-api

* removed class variables
* removed 2nd contructor
* synced javadoc
dropdeserializer now working

shameless stolen from @L-Henke
changed test accordingly to new api
ignore droptests for now (again)
removed unneeded object
changed return of send() from void to int
Merge pull request #74 from jan-schreib/drop-api
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