Add recursion to mod deletion

The mod deletion method will now traverse through all the
subdirectories it finds and will only delete zips and jars. This will
occur for both the mods and coremods.

Signed-off-by: Tristen Allen <spyboticsguy@gmail.com>
Make mod recursion sensible

Reworked the mod deletion to recurse in a manner that is not bat-shit
insane.

Signed-off-by: Tristen Allen <spyboticsguy@gmail.com>
Merge pull request #9 from Spyboticsguy/master

Change mod delete behavior: recursively delete jars and zips in order to handle chicken bones' 1.6.4 library setup while (hopefully) not disturbing badly-placed config folders.