Berserk

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* Add simuls
* Add studies export and export chapter
* Add tournament results, games export, and list by creator
* Add user followers, users following, rating history, and puzzle activity
* Add new ``Teams`` client: join, get members, kick member, and leave
* Updated documentation, including new docs for some useful utils
* Fixed bugs in ``Tournaments.export_games``
* Deprecated ``Users.get_by_team`` - use ``Teams.get_members`` instead

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* Add py37 to the travis build
* Update development status classifier to 4 - Beta
* Fix py36 issue preventing successful build
* Make updates to the Makefile

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* Add logging to the ``berserk.session`` module
* Fix exception message when no cause
* Fix bug in ``Broadcasts.push_pgn_update``
* Update documentation and tweak the theme

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* Add ``ResponseError`` for 4xx and 5xx responses with status code, reason, and cause
* Add ``ApiError`` for all other request errors
* Fix test case broken by 0.4.0 release
* Put all utils code under test

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* Add support for the broadcast endpoints
* Add a utility for easily converting API objects into update params
* Fix multiple bugs with the tournament create endpoint
* Improve the reusability of some conversion utilities
* Improve many docstrings in the client classes

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* Fix bug where options not passed for challenge creation
* Convert requirements from pinned to sematically compatible
* Bump all developer dependencies
* Use pytest instead of the older py.test
* Use py37 in tox