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 Dictionary for Python 3
Merge remote-tracking branch 'upstream/develop' into develop
HdpModel.print_topics now has an informative docstring and prints to log.

Resolves #189.
Merge pull request #190 from Tiepies/develop

Fixed HdpModel.print_topics and added HdpModel.show_topics
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
Merge pull request #191 from larsmans/py3-dictionary

fix Dictionary for Python 3
add slow (python) version of word2vec training
update CHANGELOG with HDP printing
remove slow word2vec version
make gensim run on python3
* targeting 3.3+
bring py3k to the deprecated preprocessing module too
add py3.3 to travis
py2.6 & py3.3 build fixes
try to make travis tests work on py3.3
fix hash dictionary py3
fix py3k print statement
add py3.4 to travis