DOC/WIP: rework doc layout
iter
Searchlight doc
Iterate on new docs
Iter on new docs
iter docs
DOC: Address @AlexandreAbraham's comments
iter doc
Merge pull request #122 from GaelVaroquaux/new_docs

New docs
Iter docs
BUG/DOC: examples are in root folder in nilearn

gen_rst.py had been incorrectly ported from scikit-learn
Fix gen_rst
BUG: follow sklearn API change
resolved conflict