[MRG] FIX HashingVectorizer + TfidfTransformer fails because of a stored zero#7502

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rth wants to merge 3 commits intoscikit-learn:masterfrom

rth:hash_vect_collision

Commits on Sep 27, 2016

PR 5861: Eliminate zeros after summing duplicates

justinvf
authored and
rth
committed
Added a test for hash collision in HashingVectorizer
rth
committed

Commits on Sep 28, 2016

Moving the collision test to test_feature_hasher.py
rth
committed