Initial commit of xcode project file.

For including the libraries statically (libpcre.a & libgc.a) :: Xcode
menu > View > Utilities > File Inspector --> Select the static library
file, and then set 'File Type' as 'Mach-O object code' in 'Identity and
Type'.
Tweaks and cleanup.
Added Rakefile to xcodeproj to handle external libraries
Initial Commit
Added Rakefile to xcodeproj for external libraries