Theirs Merge commit '0.7' into releases

* commit '0.7': (247 commits)
  Replace latex with simple syntax in docstrings.
  Documentation update.
  Change release name to 0.7.
  FIX: mxf --> Xinfan Meng
  Some more changelog stuff.
  More fixes for the changelog.
  Add metrics to the doc.
  Minor fixes in changelog.
  More on changelog.
  More doc on 0.7 release.
  Changelog for 0.7
  Examples cleanup: remove pl.close, it is now handled by gen_rst.
  Some more docstring fixes for mixture.
  Rename nobs --> n_obs
  Rename ndim --> n_dim
  More cosmetic changes in GMM.
  Cosmetic fixes in GMM.
  Second patch by f0k.
  Improve performance of GMM sampling
  fix LassoLARS docstring
  ...