Configure docs to render markdown and expose HAS_PYMC

[michaelosthege]

The purpose of this PR is to get some early commits from #12 out of the way.

[codecov-commenter]

Codecov Report

Merging #14 (582ce1f) into master (7d1b7a4) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   93.67%   93.68%           
=======================================
  Files           5        5           
  Lines         664      665    +1     
=======================================
+ Hits          622      623    +1     
  Misses         42       42           

Impacted Files	Coverage Δ
calibr8/__init__.py	66.66% <ø> (ø)
calibr8/utils.py	90.47% <100.00%> (+0.06%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7d1b7a4...582ce1f. Read the comment docs.

[lhelleckes]

All fine!