Require a modern setuptools with pip.
Merge pull request #2 from 99designs/bugs/setuptools-fix

Setuptools fix for broken pip installs
Actually install pip on pip.bin dep.

This was recently broken in the setuptools fix.
Merge pull request #3 from 99designs/bugs/setuptools-fix

Fix pip issue broken in recent change
Allow binaries to be scattered all over the system
Test for setuptools version more idiomatically
Removing llvm references in xcode tools

They're no longer supported in XCode 5 https://developer.apple.com/library/ios/documentation/DeveloperTools/Conceptual/WhatsNewXcode/Articles/xcode_5_0.html