Split out framework and static library builds.

Also reference a submodule for ActiveSupportKit instead of using project relative paths.
Adds testing schemes.
Fixes copy headers build phase.
Merge branch 'issues/separate-framework-and-lib'

* issues/separate-framework-and-lib:
  Fixes copy headers build phase.
  Adds testing schemes.
  Split out framework and static library builds.

Conflicts:
	ActiveModelKit.xcodeproj/project.pbxproj
	ActiveModelKit/ActiveModelKit-Info.plist