Since it can't actually install anything because it throws TypeError
versions 4.3.14 through 4.3.16 are affected.
See https://github.com/conda/conda/issues/5033 for details.
blacklist conda 4.3.14 and conda-build 2.1.6,2.1.7, as they cause travis condarecipe build to fail reporting a signal-releated TypeError.
Also alter tox script by adding conda-forge channel at lower priority than defaults
[skip Appveyor]
* build docs through tox environment
* build docs on travis. Travis build checks that we haven't broken docs which would get pushed to rtd
* generate docs directly from repo markdown using recommonmark, rather than converting into new files with pandoc
* unpin recommonmark version
* remove redundant makefiles, rely on tox to do our docs building (we don't really reliably support anything bar html/json generation anyway)
* remove redundant conda `docs/environment.yml`
* fix docs version using `.bumpversion.cfg`
* update docs readme
Josh Barnes