Reduce size of the release distribution. Fix #1698

[menshikh-iv]

What's done:

• removed docker/
• removed continious_integration/
• removed docs/

Result: 63MB -> 14MB for tar.gz

Last large part is distrib is gensim/test/test_data, biggest file is:

• large_tag_doc_10_iter50 - 4.8MB
• small_tag_doc_5_iter50 - 2.3MB
• head500.noblanks.cor - 2.3MB
• pang_lee_polarity_fasttext.vec - 1.8MB
• enwiki-latest-pages-articles1.xml-p000000010p000030302-shortened.bz2 - 1.7MB
• lee_fasttext - 1.1MB

But I think that we no needed to replace it & fix tests, wdyt @piskvorky?

[piskvorky]

Can't we distributed these large data files as .gz? We're using smart_open anyway.

[menshikh-iv]

I think that most of this is binary and will be compressed poorly @piskvorky (also, tar.gz already compressed format, for this reason, this has no sense).

[piskvorky]

Yeah, that's true. Scratch that :)