update resource_builder to take project argument

[supertom]

Prepend project id string to arn field to avoid key collusions.

Fixes #725.

Two possible concerns here:

• This could make the arn very long. Not a problem for the db column (Text), but could be for places on screen.
• Anyone using the existing version will end up with different arns after an update. Still, since GCP functionality is young, might make sense to do it now

[coveralls]

Coverage remained the same at 63.046% when pulling 1d875c1 on supertom:granular-gcp-arn into abb176f on Netflix:develop.