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

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) in order to get `xctool test` on a clean project to build.

However, leaving the `xctool build -scheme Pods` script step in .travis.yml since just `xctool test` as a single step breaks on Travis-CI.  Yeah, I know: insanity.