f2c: remove checksum

Closes #73.
New formula: rapidjson

Closes #75.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libemu: modernize autotools deps
smpeg: modernize autotools deps
willgit: update homepage

The old homepage is no longer online - redirect to the git repo.

Closes #78.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
Rename stmd to commonmark