Initial MFR player commit:

Works with images. Will need edits for other types.
Merge pull request #31 from alexschiller/feature/player

Feature/player
Initial Previewer commit:

Adds working flask app. Works with  images but will need further changes to work with static files.
Merge pull request #32 from alexschiller/feature/player

Initial Previewer commit:
Merge pull request #33 from kmjungersen/feature/rst

Feature/rst
(actually) added RST rendering