Fix PATH for "make test-web-app" to find rake.
Fix PATH for "make test-web-app" to find rake.

apinf/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,NREL/api-umbrella,NREL/api-umbrella,apinf/api-umbrella,apinf/api-umbrella