Fix issues with `WordOccurenceAccumulator`on Windows.  Fix #1441 (#1449)
Fix issues with `WordOccurenceAccumulator`on Windows.  Fix #1441 (#1449)

* #1441: Fix issues with `WordOccurenceAccumulator` on Windows.

* #1441: Use pre-scipy0.17 version of `scipy.sparse.diags` function by passing explicit `offset` parameter.

markroxor/gensim,mattilyra/gensim,markroxor/gensim,gojomo/gensim,piskvorky/gensim,summanlp/gensim,piskvorky/gensim,RaRe-Technologies/gensim,mattilyra/gensim,piskvorky/gensim,macks22/gensim,RaRe-Technologies/gensim,markroxor/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim,gojomo/gensim,ELind77/gensim,macks22/gensim,ELind77/gensim,gojomo/gensim,gojomo/gensim,ELind77/gensim,macks22/gensim,mattilyra/gensim,summanlp/gensim,summanlp/gensim