prevent unclosed file warning from Python 3
fix broken relative import in Python 3

Verified that tests still pass in Python 2.7.
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.
Merge pull request #181 from sebastien-j/cbow_minor_bug_fix

Fix CBOW bug (optimization 2)
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.
Merge pull request #188 from fayimora/patch-1

Return topics in the right order
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