Add Travis CI's Build Matrix

See also : http://docs.travis-ci.com/user/build-configuration/#The-Build-Matrix
Add Travis build status badge

  NOTE : This URL indicate `dev`-branch status.
Merge pull request #4 from t-mat/travis-ci-build-matrix

Add Travis CI Build Matrix to decrease testing time
Travis status for both master & dev branches, thanks to Takayuki Matsuoka
Added : *_withDict to fullbench
changed naming convention to *_usingDict()
Add (modified, stripped) FarmHash 1.0.0
Refactor hash function selection

 - Add proper macro for hash function/states.
 - Decrease number of #if by hash function/state macros.