ISSUE #10 - gwt support 
- Added gwt dependencies
- Changed JsonDiff to use addFirst and removeFirst instead of push and
pop (not supporte by gwt's jre emulation)
- Minor Tests Refactor to allow GWTTestCase

TODO: Export library so it can be used from javascript directly
misuse of the splice method
http://code.google.com/p/google-web-toolkit/issues/detail?id=6443
new (slightly different) approach to diff creation
new algorithm for diff creations and new patch syntax
#14
all tests pass :)
2.0 branch