remove import
Improve doc
COSMITS + FIX to impurity_improvement
FIX: impurity_improvement
TEST: disable test_32bit_equality
Update max_depth in DepthFirstSplitter + Release splitter in BestFirstSplitter
Merge pull request #7 from glouppe/gbm

Changes
fix tutorials index, update dropdown menu in navbar, update stat_learning tutorial link on documentation.html page
typo fix
Merge branch 'master' into DOC_olivier_tut
X need not be continous anymore (since we adhere to col and row strides)
remove extra headings from tuts page
cosmit: doc undocumented functions
update what`s new
BUG: fix convergence check in OMP
Merge pull request #2541 from dengemann/fix_dot

[MRG]: fix tests, centralize warnings and reset `__warningregistry__`
py3k syntax
Merge pull request #2624 from dengemann/fix_dot

FIX: py3k syntax in recently added doctest
cosmit: remove commented out code - add comment
Add max_leaf_nodes to forest + DOC