Separate framework and lib.

Use Xcode workspace to manage separate OSX framework and iOS static library projects.
Configures shared schemes.
Change location of scheme files.
Adds ActiveSupportLibTests scheme.
Works around Xcode relative path bug.

Xcode has an issue with files located above the folder where a project file is located. The problem appears when trying to navigate to a test failure file/line combination in one of these files.  Xcode can parse the filename, but cannot navigate to the actual line number.  By reorganizing the folders I was able to get around this issue.

Also moves the shared schemes back into the xcworkspace.
Add scheme for testing the library.
Copy header files to correct locations.
Ignore project.xcworkspace
Merge branch 'master' into issues/separate-framework-and-lib

* master:
  Ignore project.xcworkspace
  Version 1.5
  Build 120.3
  Fixed RFC-2822 test; uses default local time zone
  Xcode 4.6 validated settings: enables various warnings

Conflicts:
	ActiveSupportKit.xcodeproj/project.pbxproj
	ActiveSupportKit/ActiveSupportKit-Info.plist
	ActiveSupportKitTests/ActiveSupportKitTests-Info.plist
Merge branch 'master' into issues/separate-framework-and-lib

* master:
  Copyright 2011–2013

Conflicts:
	ActiveSupportKit/ActiveSupportKit-Info.plist