Fix as_float_array behaviour when copy=True
Add test of the as_float_array behaviour when copy=True
Add a copy parameter to safe_asarray()
Imp readability
FIX missing class attribute in ICA. Common test was failing
DOC: some documentation for the Tree Cython structure
FIX: fastica function dictionary default value
DOC copyedit RBM docstrings

Removed the fake LaTeX; it wasn't showing up on the website
and it looks bad in IPython.
Merge pull request #2216 from glouppe/tree-doc

[MRG] Additional documentation for the Tree cython structure.
Deprecate FastICA.sources_
Rename LabelBinarizer.multilabel to .multilabel_ + DOC
WIP: partial fit for discrete naive Bayes models
Remove the class_prior partial_fit param
WIP: started to factorized the raw count collection
Incrementally is useless now
Add reference to the Manning text + restaure previous smoothing
FIX shape issue when y has only one single class + some missing doc
Factorize common classes checks in partial_fit implementations
Add note on a possible future performance optimization
Add a note on performance tradeoffs in the docstring of partial_fit