Fixed capitalization of "Application Support"

First of all, this is a stupid pull request. It's like being a code grammar nazi.
However, this actually caused problems for me as I use Mac OS Extended (Case-sensitive, Journaled). So this pull request fixes a problem that probably affected a grand total of 5 people. But it still fixes something.

Also I made the icns for building on OS X transparent, which looks a lot nicer in the dock.