Gensim

* improved performance of sharding (similarity queries)
* better Wikipedia parsing (thx to Alejandro Weinstein and Lars Buitinck)
* faster Porter stemmer (thx to Lars Buitinck)
* several minor fixes (in HDP model thx to Greg Ver Steeg)
* improvements to documentation

* better support for Pandas series input (thx to JT Bates)
* a new corpus format: UCI bag-of-words (thx to Jonathan Esterhazy)
* a new model, non-parametric bayes: HDP (thx to Jonathan Esterhazy; based on Chong Wang's code)
* improved support for new scipy versions (thx to Skipper Seabold)
* lemmatizer support for wikipedia parsing (via the `pattern` python package)
* extended the lemmatizer for multi-core processing, to improve its performance

* fixed Similarity sharding bug (issue 65, thx to Paul Rudin)
* improved LDA code (clarity & memory footprint)
* optimized efficiency of Similarity sharding

* improved gensim landing page
* improved accuracy of SVD (Latent Semantic Analysis) (thx to Mark Tygert)
* changed interpretation of LDA topics: github issue 57
* took out similarity server code introduced in 0.8.1 (will become a separate project)
* started using `tox` for testing
* + several smaller fixes and optimizations

* transactional similarity server: see docs/simserver.html
* website moved from university hosting to radimrehurek.com
* much improved speed of lsi[corpus] transformation:
* accuracy tests of incremental svd: test/svd_error.py and https://groups.google.com/g/gensim/c/S2BbcvgGJ3A
* further improvements to memory-efficiency of LDA and LSA
* improved wiki preprocessing (thx to Luca de Alfaro)
* model.print_topics() debug fncs now support std output, in addition to logging (thx to Homer Strong)
* several smaller fixes and improvements

* changed all variable and function names to comply with PEP8 (numTopics->num_topics): BREAKS BACKWARD COMPATIBILITY!
* added support for similarity querying more documents at once (index[query_documents] in addition to index[query_document]; much faster)
* rewrote Similarity so that it is more efficient and scalable (using disk-based mmap'ed shards)
* simplified directory structure (src/gensim/ is now only gensim/)
* several small fixes and optimizations