Merge pull request #1 from EasonLiao/master

Create a project skeleton.
Merge pull request #2 from EasonLiao/master

Add travis and some changes on package names.
Merge pull request #3 from EasonLiao/master

Switch to using release version of Jzab.
Merge pull request #5 from EasonLiao/master

Bulild a skeleton of Skipper and a not fully featured Map implementation
Implemented all the operation needed by ConcurrentMap interface.
Merge pull request #6 from EasonLiao/more_features_map

Implemented all the operation needed by ConcurrentMap interface.
Implemented a simple non-blocking queue.