sorting dictionary text by decreasing word frequency. useful when analysing dictionary quality
Merge branch 'develop' of https://github.com/renaud/gensim into develop

Conflicts:
	gensim/corpora/dictionary.py
added sorting-by-frequency as an option = a new method parameter
using iteritems(dict) for Python3 compatibility
fix incorrect indent
fix typo in Text8Corpus
make travis CI logs less verbose
fix header paths for Cython
Merge pull request #1 from piskvorky/cythonize_setup

various fixes
Merge remote-tracking branch 'renaud/develop' into develop

Conflicts:
	gensim/corpora/dictionary.py
add test for Dictionary.sort_by_word
add Renaud to CHANGELOG
avoid travis CI timeouts
Merge remote-tracking branch 'besser82/cythonize_setup' into develop

Conflicts:
	.travis.yml
make scipy shut up
update CHANGELOG
Add negative sampling (cython only)

Changes made to word2vec.pyx
word2vec.py has not beeen modified yet.
Not tested.
added negative sampling
Add random_numbers (array) to word2vec

For the Cython implementation of negative sampling
Minor bug fix
Correct syntaxt error in ctype def statement