fix(builder): revert to testing local package

`go test` doesn't like it if there's multiple main scripts in the same
directory. Since there are no other packages to test, `.` tests
everything.

From a platform-wide perspective this does seem odd, but it's only
because builder is not built with Go from the ground up, whereas the
logger, logspout and publisher are pure Go.

Author: Matthew Fisher

builder/Makefile

@@ -66,7 +66,7 @@ deploy: build dev-release restart
 test: test-unit test-functional
 
 test-unit:
-	godep go test -v ./...
+	godep go test -v .
 
 test-functional:
 	@docker history deis/test-etcd >/dev/null 2>&1 || docker pull deis/test-etcd:latest