-[IOS8] Project now compiles with iOS 8 and Xcode 6. Fix based in newer JSC versions.
-[IOS8] Added x86_64 slice to make.py to be able to build and test in 64 bit simulators.
-[HOUSEKEEPING] Cleaned up commented code.
-[BUILD] If the derived data path is passed through the command line, subfolders are added for each target to avoid collisions.
-[BUILD] Fixes build issues when the target path points to a different file system (like external hard drives)
Merge pull request #23 from TrompoGames/master

iOS 8 Compatibility + build script fixes.