got rid of all the use_eigen stuff
merged updates from negative-binomial-stuff branch
switched util version
updated log_likelihood to work with _states_class
updated pybasicbayes with nonconj gaussians (lightly tested)
pulled pybasicbayes to fix GaussianNonConj bug
added example file
explained demo better
tweak
updated pybasicbayes
updated pybasicbayes
added np.asarray(data,dtype=np.float64) to add_data calls
updated util submodules
added viterbi, needs testing
viterbi working!
fixed bugs!
Merge branch 'master' into negative-binomial-stuff

Conflicts:
	models.py
	util
closer to getting HSMMIntNegBin EM working
added a todo tag
fixed erroneous assertions
viterbi with hsmm intnegbin seems to work