Enhanced tests for blockwise transfer and fixed some bugs
Removed all logic from exchange into layers
Simplified and removed redundancy from blockwise transfer layer
Moved classes that for debugging, which will be removed later, into a new package *.californium.debug
Renamed parser classes
Included DLTS. It is not yet compatible to the new Cf thouth
DTLS integrated. Basically it all fits together but this keystore thing does  not work
Tried to generate a key for using DTLS according to Appendix C of Stephan's master thesis but the very last step did not work
Extracted Matcher and Serializer from CoAP stack. Declared corresponding old layer classes deprecated.
Renamed dlts package correctly dtls
Renamed some other packages and classes
Added documentation
Added documentation for most classes
Clean up in Endpoint
removed som @Test because I hope it might make the build not fail when I push... probably not, though