Fix CBOW bug (optimization 2)
Various Python 3 fixes

Test results now failures=4, errors=10
Down from        failures=5, errors=68

Not counting testLineSentenceWorksWithCompressedFile from word2vec
tests, which ends up in what seems to be an infinite loop.
fix MmCorpus serialization on Windows
minor doc update
* get rid of the word "framework", sounds too fancy
sync dfs with token ids in Dictionary.from_corpus
update CHANGELOG with MmCorpus fix
print a warning when ppl try to do corpus.save() instead of serialize()
Windows fix: treat word2vec files as binary
minor docs improvements
remove tmp_dir in Mallet wrapper, fixes #184
Return topics in the right order

Passing -1 or n, where n >= num_of_topics to show_topics() should return the topics in the right order. It currently returns the topics in the reverse order which is difficult to reason about.
update CHANGELOG
add topic printing to LdaMallet
minor doc fix
Fixed HdpModel.print_topics and added HdpModel.show_topics

Fixes #189. HdpModel.show_topics and HdpModel.print_topics now have the same functionality as LdaModel.show_topics and LdaModel.print_topics.
fix LdaMallet bug where model[vec] returned a corpus
* now a vector on input returns a vector on output as expected
add LdaMallet unit tests
add Similarity method for cleanup in unittests, fixes #182
revert py3k change that breaks dict mixin
up version: 0.9.1