Create initial formula for installing kicad

Kicad testing and stable versions are supported.  There are also
commented links to my github mirror since it is 1000x fast to check out
that using bazar.

Patches applied:
1) Required a patch since for some reason kicad disables the aui
module for wxWidgets which is required for compilation.
2) A second patch enable retina display on kicad

The caveat with location to app bundles like macvim.
Make sure that during devel version it takes from the testing branch
and passes the -DKICAD_TESTING_VERSION flag

Uses inreplace to set the share path to /usr/local/share instead of
the default for OSX /Library/Application Support