ENH remove unnecessary CSR->CSC transform in text feature extractors
Merge pull request #2772 from jnothman/tfidf_no_copy

[MRG] ENH remove unnecessary CSR->CSC transform in text feature extractors
ENH: MultiTaskElasticNet (and Lasso) CV
DOC make indifferent to compressed sparse orientation
Fix some typos in whats_new.rst, using ispell
DOC add link to module reference from class/function pages
Merge pull request #2779 from jnothman/ref_sec_link

[MRG] DOC add link to module reference from class/function pages
Update plot_digits_pipe.py

Import statements have been moved to the top of the file.
Merge pull request #2780 from ugurthemaster/patch-1

Update plot_digits_pipe.py
DOC: some underlines were too short