MAINT simplified `setup.py`

  Unlike the version inherited from `scikit-learn` the new version
  requires Cython to be installed
MAINT use conda in `.travis.yml`
MAINT replaced C classifier for Cython
MAINT install Cython when running on Travis
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.
Add support for PoissonHMM and ExponentialHMM.
Various improvements and extensions

- Change 'n_components' to 'n_states' throughout hmm.py
- Use priors for initialization, not the m_step
- Add support for MixtureHMMs (particularly Multinomial)