FIX remove confusing BaseEstimator.__str__
Replaced abbreviated 'w.r.t' to 'with regards to'
Doc fix - Compiled .pyx files with Cython 0.20
FIX error message with sparse precomputed kernels

Reported at SO, http://stackoverflow.com/q/21639685/166749.
Revert "FIX error message with sparse precomputed kernels"

This reverts commit 71fa2683def41e7b39b1f60bada4a289b71b04fd.

The issue is more complicated than I thought.
FIX error message with sparse precomputed kernels (second try)

This time, all tests pass.
MAINT optimize Spotify logo (- a few hundred bytes)
FIX restore _pairwise on SVMs

Added a comment explaining what this property does.

This time, did a *full* test and only got an unrelated error.
Sorry for the noise.
Fixed incredibly minor spelling mistake
Merge pull request #2840 from earino/develop

DOC Fixed minor spelling mistake
Merge pull request #2830 from eltermann/wrt-abbreviation

Replaced abbreviated 'w.r.t' to 'with regards to'
Merge pull request #2750 from jnothman/no-str

FIX remove confusing BaseEstimator.__str__
What's new: group entries by topic
Remove superfluous AdaBoostRegressor call.
Merge pull request #2852 from jwkvam/adaboost_test

Remove superfluous AdaBoostRegressor call.
MISC: better error messages in BaseLibLinear