added Iterator class to read fakenect recordings
added Iterator class to read fakenect recordings (actually this time)
defined featureExtraction interface (doesn't work yet)
finished wichanges to feature extraction interface
HMM stuff (not working yet)
HMM training working
initial cross-validation code
pickle training data
working on HMM demo and cross-validation
saving whatever I might have done
Merge branch 'master' into jen_working_branch