Document build_ext --inplace before testing.

Otherwise we get a "ImportError: cannot import name _hmmc".
Merge pull request #11 from jdswinbank/docfix

Document build_ext --inplace before testing.
format change according to sklearn.
save unnecessary memory usage.
Merge pull request #13 from csytracy/master

Format change and saving memory.
Randomize GMM initialization for GMMHMM.
Fix error in accumulating suff. stats for GMMHMM.
Add verbose reporting.
Fix observation checking for multinomial hmm.