Merge pull request #1582 from ApproximateIdentity/doc-n_jobs-parallel

Changed minus sign to plus.
ENH we require a version of sphinx sufficient for "new" numpy_ext to work
FIX instead of appending numpy_doc to the list of extensions, directly add when creating the list
faster sample_weight initialization
speed improvements to make_gaussian_quantiles
even more speed improvements to make_gaussian_quantiles
py3k
BUG don't write comments in SVMlight dumper by default

Fixes part of Issue #1501
DOC: note initialization of sample_weight if None
factorize common sample_weight check
DOC some sphinx fixes
DOC fix in mds example (new interface)
DOC mds example: suppress warning for explicit initialization
DOC don't use deprecated parameter rho in the lasso / enet examples
COSMIT typos in hierarchical clustering warning
DOC more sphinx fixes
BUG hotfix for issue #1501: sort indices in SVMlight i/o

CSR matrices are strange beasts.
Merge branch 'master' of github.com:scikit-learn/scikit-learn into adaboost
FIX: some nitpicks
Merge pull request #24 from glouppe/adaboost

Fix some nitpicks