Decoder refactor

[jindrahelcl]

Tests OK, I will merge this today if there's no objections.

EDIT: monster_decoder.py is the original decoder with (czech) comments. This will be deleted as soon as a separate copynet decoder is created and the code from monster_decoder is moved there. Another leftover code in the monster decoder is the scheduled sampling mechanism.

EDIT2. travis tests are not ok. investigating.. Nechápu, travis padá na python3 chybě, kterou zanesl @tomasmcz s commitem 'Fix everything', ale u mě na počítači to na ní nepadá a testy projdou.

[jlibovicky]

File "/home/travis/build/ufal/neuralmonkey/bin/neuralmonkey/dataset.py", line 62, in create_series
file_type = magic.from_file(path, mime=True).decode()

To by mělo udělat z bytestreamu string, ale v ten okamžik už to zjevně string je, takže není důvod volat decode. Ačkoli u mě to taky prochází.

[jindrahelcl]

Právě, když si zapnu svuj python3 a zkusim na string zavolat decode(), tak to padne, ale když pustim tohle, tak to nepadne. Takže se tam děje něco divnýho

[tomasmcz]

As this is clearly happening in the part of code that was changed several commits ago and behaves differently at your local environment and clean environment on Travis, you should suspect a change in dependencies. And indeed, python-magic 0.4.12 was released and it now returns string instead of bytes. I fixed this in master and rebased. Your local tests worked, because you had older version of python-magic installed.

We should discuss freezing of dependencies in #55.

[tomasmcz]

Btw. the discussion in #55 is something that I would like to be accessible in the future and therefore should be conducted in English. And since I want to refer to this PR as an example there, this should also have been in English. I really can't see any rational reason to write anything in Czech (and I find constant switching between languages quite bothersome).

[tomasmcz]

I don't have time to read all the code right now, but at least the comment in mixer.py should be in English as well. I appreciate the detailed pylint: disable in decoder.py though.

[jindrahelcl]

Merging, closing.