Refs #46. Re-ran sphinx-quickstart to update
Refs #46. Use the RTD theme for local HTML
Refs #46. Added a docs requirements file
Refs #46. Added docs/_build
Refs #46. Build the docs
Refs #46. Added testing requirements
Refs #46. Use testing requirements
Merge pull request #46 from PolicyStat/issue_46

Update documentation to use sphinx, setup hook to build on RTD