Merge tag '0.17' into releases

scikit-learn 0.17 release

* tag '0.17': (41 commits)
  Fix import of reload for python 3.3
  MAINT version string for 0.17. D'OH
  split installation into simple and advanced part
  skip unstable tests and doctests  on 32bit platform
  More doc fixes. Latex builds again.
  REL add 0.17.0 release to news
  DOC some fixes to docbuild
  MAINT Don't use deprecated 1d X (or deprecated matplotlib stuff) in examples.
  Version added for all new classes and parameters
  DOC Typo fixes in whatsnew. Thanks @jnothman
  Ensure that n_nonzero_coefs is an int
  Add missing whatsnew entries for 0.17
  FIX port LDA covariance fix to decomposition module
  DOC some fixes to the doc build.
  FIX don't compare things that can be arrays to strings.
  fixed missing import from too much cherry picking.
  fix 1 sparse row scaling in robust scaler
  OneHotEncoder warn fix
  Don't use floats to index numpy arrays
  REL Make 0.17 website changes for release.
  ...