Fix RAC reference, :fire: Specta and Expecta
Just generally fix a bunch of things in the project
Update to jspahrsummers/objc-build-scripts@a54782
Fix compilation of Squirrel source files
Bump deployment target of tests
Manually import/link everything ShipIt depends on

These have to be statically built into the ShipIt, since (by contrast)
dynamic frameworks could disappear out from under it during the update
process.
Add Quick and Nimble to test target
Import Nimble and Quick errrrrywhere