rename dependency -> dependence
rename dependency -> dependence
add partial dependence plot example
Merge branch 'master' into gbrt-interactions

Conflicts:
	doc/modules/ensemble.rst
Merge branch 'master' into gbrt-interactions
raise error if both grid and X are specified
initialize estimators_ with empty array not None
more input validation for partial dependence and doctest
tests for partial_dependence
rename learn_rate -> learning_rate
input validation for grid
test cases for grid
pep8
added test for cartesian
add partial dependence to whats new
documentation for partial dependence plots
add module imports
typo
cosmit
call pl.show