Add -j option to specify number of simultaneous make jobs.
Drop armv6 arch, add armv7s arch
Remove unneeded shift
Fix compiler path for xcode 5.1
Don't build twice for updating (although maybe we're supposed to?)
Only build the library; we don't need to build the compilers
Merge pull request #75 from asivitz/master

Improve iOS Build Script
Be permissive in encoding of EOL of source code (allow LF, CR and CR/LF)
On OS X, avoid C compiler options that are specific to GNU gcc and that LLVM gcc does not accept