working on the SteppingOnTrapsExtractor--work to be done, needs to be tested
Added SteppingOnTrapsExtractor (whoops, commited previously without adding!)
Lots of fun changes :D
FeatureConstants now extend Constants (rather than requiring implementing both)
 -> also added constans for SteppingOnTrapsExtractor
SteppingOntrapsExtractor has been (thoroughly!) tested...
All of the testing can be found in FeatureExtractorTest
Added a comment to SteppingOnTraps' constants class
Merge branch 'master' of https://github.com/vmohan7/Arimaa into neema_trap-stepping_feature

Conflicts:
	ArimaaBot/src/feature_extractor/FeatureConstants.java
	ArimaaBot/src/feature_extractor/FeatureExtractorTest.java