made changes to position and movement extractors and added stub for freezing extractor
tested freezing feature
constants didn't merge properly
Update README.md
Update feature indices.
Update README.md
Update README.md
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