cosmetic remarks incorporated
Merge branch 'glbugfixes'
cosmetic remarks, pep8 compliance against trailing white spaces, spelling errors
clean up
Merge pull request #2505 from rphlypo/master

bug fix in GraphLasso/CV and corresponding smoke test + EmpiricalCovariance updates
Put more code under non-GIL block
Clarification of the sequence length, per @ogrisel
Merge pull request #2525 from rmcgibbo/hmmfix2

Fixes to HMM docstrings
Merge pull request #2517 from jaquesgrobler/simpler-collapsible-toctrees

Cleaner Toctree collapse for useguide
Update dict_learning.py

Added parallelisation for online dictionnary learning algorithm.
Merge pull request #2533 from samuelstjean/patch-1

Update dict_learning.py
DOC norm optimizations in what's new

As requested by @ogrisel.
MAINT remove mlcomp document classif. example

It's redundant given the other 20newsgroups example.
ENH optimize one more sq. distance in k-means
Merge pull request #2528 from ogrisel/tree-nogil

[MRG] Release the GIL at tree building time
Add implementation of RANSAC algorithm
Add ransac function to __init__.py of utils package
Fix bug in residual determination
Add step-by-step description of RANSAC algorithm
Add parameter description to RANSAC and modify API