updated OSX instructions
also, markup and stuff
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Use clang on OS X instead of gcc48

Also - add 'pkgconfig' to list of MacPorts to install, as it's a required dependency.
Merge pull request #255 from ericwa/clang

Use clang on OS X instead of gcc48
pulled from ttimo/master
changed font back - was broken on windows
Merge branch 'master' of https://github.com/freemancw/GtkRadiant