Memote

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* Fix an issue where experimental data was not loaded.
* Enable command line options for solver timeouts.
* Setting the log level to DEBUG now also enables the solver log output.

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* Improve the biomass reaction finding logic.
* Explicitly register custom markers `biomass`, `essentiality` and `growth`
used for custom test parametrization in pytest.
* Fix logic for `consistency` tests of production and consumption of
metabolites with open bounds. It allows multiprocessing, currently relying on
`cobra.Configuration` to select the number of processors.

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* Pin cobrapy version to <= 0.14.2 (because cobra==0.15.1,0.15.2 SBML parsing
is broken).

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* Pin cobrapy version to 0.14.2 (because cobra==0.15.1,0.15.2 SBML parsing
is broken).

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* Include memote's requirement for git on installation instructions.
* Check for the presence of `git` in CLI commands that require it.
* Replace vega with taucharts in all reports.
* Fix plots to be large enough.
* Fix responsive behaviour.
* Add clear axis labels and understandable titles.
* Add an option to save all plots to png, json and csv.
* Color code the category plots just like the results buttons
on the snapshot report.
* Fix the data that is displayed in the independent an specific sections
of the history report.
* Invert metrices and display as percentages.
* Add hover-over tooltips for all plots.
* Implement lazy loading for all the reports, meaning that the content of
an expansion panel in any of the reports is only rendered when it is open.
* Fix the reactions with identical genes test case to not group all reactions
without any GPR together.
* Enable CI on Appveyor (unit tests on Windows as opposed to linux which we do
on Travis).
* Replace any commit operations through gitpython with direct subprocess
invocations of git.
* Regenerate the mock repo we use in some tests so that filemode changes are
ignored by default.

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* Repair `memote online` which would not get the most up-to-date status when
checking whether a repo had already been activate for testing on Travis CI.
* Pin `travis-encode` due to conflicts in dependency on `click` with
`goodtables` and `jsonschema`.