++Archimedes and RAC for header copying fixes
Remove settings duplicated from xcconfigs
Remove header search paths for Archimedes and RAC
Use framework style imports
Add a Copy Headers build phase
Merge branch 'master' into copy-headers

Conflicts:
	External/ReactiveCocoa
Merge pull request #46 from github/copy-headers

++xcconfigs, set up PUBLIC_HEADERS_FOLDER_PATH to make importing easier