First pass at content flagging

[makyo]

Address #42, though some implementation details left

[coveralls]

Coverage decreased (-0.8%) to 96.871% when pulling cdf58cf on makyo:flags into 7843974 on OpenFurry:master.

[coveralls]

Coverage decreased (-1.3%) to 96.396% when pulling 0289d0b on makyo:flags into 7843974 on OpenFurry:master.

[makyo]

Fixes #42

[coveralls]

Coverage decreased (-1.6%) to 96.068% when pulling 5593689 on makyo:flags into 7843974 on OpenFurry:master.

[coveralls]

Coverage increased (+0.8%) to 98.506% when pulling cc819f2 on makyo:flags into 7843974 on OpenFurry:master.