Remove compute_importances parameter
What's new
FIX docstring deletions
ADD test coverage for _check_stop_list
FIX comment typo
ADD test cases to fill out VectorizerMixin coverage
ADD another VectorizerMixin test
ADD test for get_feature_names
ADD test for tfidf fit with incompatible n_features
ADD test for TfidfVectorizer attribute setters
ENH: Remove compute_importances in AdaBoost
ENH: Update feature_importances in GBRT
ENH: remove "mse" method and simplify
COSMIT
DOC: feature importances
Merge pull request #1657 from glouppe/feature-importances

[MRG] Remove compute_importances
 MV Mixin tests to CountVectorizer tests
RM CV import
MV _check_stop_list tests to CV get_stop_words
Merge pull request #1660 from rlmv/fe_tests

test cases for feature_extraction.text