rebase on upstream, and delete broken symlink
delete some more broken symlinks, add some extra plist keys
add SDKs for 10.1.5, 10.2.8, and 10.3.0
make the SDKs for 10.4u and 10.5 more closely match what I actually had on my computer

I'm guessing the "*.o" files must have been missing previously because
the previous committer must have gitignored "*.o" files globally or
something. This should NOT be done with this repo, because the "*.o"
files are actually part of the toolchain here.
Merge pull request #2 from cooljeanius/master

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