DOC correct note on handling 0-denominator in P/R/F
add optional banner to index page to advertise code sprints
link updated
Changed the setup instructions in the README to properly install the package in the user home.
Merge pull request #1998 from kgeis/fix-setup-instruction

Changed the setup instructions in the README
Merge pull request #1996 from jaquesgrobler/DOC_sprint_sponser_banner

add optional banner to index page to advertise code sprints
ENH: avoid MemoryError on manhattan_distances

ENH: avoid MemoryError on manhattan_distances

Very big (large p, large n) problems in manhattan_distances
create large temporaries. We work around this problem with a chunking
approach

MISC: remove debugging print

COSMIT: fix typo

ENH: chunk_manhattan data size in bytes
BUG: old versions of numpy
BUG: old versions of numpy
Corrected a few things on the Mutual Information doc pages.
TST Fixed test_pipeline_methods_preprocessing_svm: pca was unused
Merge pull request #2005 from kmike/test_pipeline_methods_preprocessing_svm

Fixed test_pipeline_methods_preprocessing_svm: pca was unused
Fixed typo in metrics.py
ENH faster unique_labels for big sequences of sequences
Fix L2 regularization order in sgd_fast
DOC explain labels parameter to confusion_matrix
corrected doctests after moving L2 penalty application in SGD
ENH speed up sklearn.feature_selection.chi2

New version is ~4× faster and reuses allocated arrays.
Merge remote-tracking branch 'upstream/master' into pr/2016
added SGD L2 fix to whatsnew