Memote

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* Repair the experimental testing and add a test case for the runner with
experimental data.
* Update docstring of test_find_duplicate_reactions.
* Add a guide explaining the structure of and how to interpret the memote
reports.
* Add guidelines on writing custom tests to the documentation.
* Add unit tests to the CLI workflow.
* Remove dependency on GitHub and Travis API wrappers, make calls through
python `requests`.
* Fix bugs in memote

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* The number of duplicated reactions is now reported uniquely rather than all
duplicate pairs.

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* Add missing parametrized metric on ``test_biomass_open_production``.

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* Add metrics, i.e., model-size independent test outcomes to almost all test
cases.
* Repair auto generation of API docs and update section on test suite.
* Remove our dependecy on PyGithub and TravisPy by reimplementing all the
necessary steps with `requests`
* Add unit and integration tests for `runner.py` and `reports.py`, except
for `memote online`.
* Debug `memote online` - could only be tested manually, CI is impossible
without a secure way of storing github credentials.
* Add logging statements to all CLI functions to facilitate future debugging.

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* Enhance the function for finding unique metabolites and make it more robust.
* Improve logging output when there is a problem with serializing a result to
JSON.
* Fix some test cases that got broken by cobrapy's new boundary identification.

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* Fix bug that would lead to biomass SBO annotations not being reported.