P-001 scheme Pod dep moved to scheme build target list

After thinking over this, telling travis to do something different than what I'd do on the CLI is dumb, if we can avoid it.  Now that I understand the system a little better, this should work.

• Removed the `xctool build -scheme Pods` script step from .travis.yml (leaving just `xctool test`.
• In Xcode, changed the P-001.G-imr scheme's Build leftsidethingy (phase? mode? product type?) to build the Pods (Pods.a) target before P-001.G-imr (and thus also before P-001 Tests).