Fixes #70.
Fixes #70.

Adds `mathjax_path` to sphinx `conf.py`, based on
http://stackoverflow.com/a/27975383. This resolves the issue.

Conflicts:
	docs/echidna.output.rst
	docs/echidna.scripts.rst
	docs/echidna.test.rst

mjmottram/echidna,drjeannewilson/echidna,jwaterfield/echidna,snoplusuk/echidna,arushanova/echidna,ashleyrback/echidna