Add `model_to_dict` one-liner to word2vec notebook. Fix #1269 (#1776)
Add `model_to_dict` one-liner to word2vec notebook. Fix #1269 (#1776)

* Add model to dict method

* add documentation and oneliner code

* Add benchmark

piskvorky/gensim,gojomo/gensim,RaRe-Technologies/gensim,mattilyra/gensim,gojomo/gensim,gojomo/gensim,piskvorky/gensim,gojomo/gensim,piskvorky/gensim,RaRe-Technologies/gensim,mattilyra/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim,mattilyra/gensim