CI with conda to work around qutip install issue

[thangleiter]

#47

[codecov]

Codecov Report

Merging #48 (2d27998) into master (21c1563) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   96.28%   96.28%           
=======================================
  Files           9        9           
  Lines        2100     2100           
  Branches      477      477           
=======================================
  Hits         2022     2022           
  Misses         41       41           
  Partials       37       37           

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[thangleiter]

Merge this for now and eventually revert back to a pip-only setup when the upstream issues are resolved.