remote_api: allow localhost:port and fix app ID regexp

Change-Id: Ice06f3d69ead72991286492a8a097f91da160874
appengine/search: Implement IDsOnly and Limit options for List and Search.

Change-Id: I61d26160a17730532cd54946a900d8adf03adae7
appengine/datastore: Support storing values whose underlying type is []byte.

Change-Id: I42ee42325e5e4462243bf3ad6add008508467553