Merge pull request #1 from DigiDNA/master

Deployment target is now 10.7. x86-64 only for OS X, with LLVM C++ library.
Merge pull request #2 from DigiDNA/master

Xcode project relocation
Merge pull request #3 from DigiDNA/master

Cleanup for SVN checkouts from GitHub...
Update for Xcode 6.1.