datastore: Two of the regression test cases continously fail

@silvolu

@silvolu, do we need to manually create indexes?

80 passing (31s)
  2 failing

  1) datastore querying the datastore should filter queries with defined indexes:
     Error: no matching index found.
      at Request._callback (/Users/jbd/gcloud-node/lib/datastore/index.js:9:12878)
      at Request.self.callback (/Users/jbd/gcloud-node/node_modules/request/request.js:121:22)
      at Request.EventEmitter.emit (events.js:98:17)
      at Request.<anonymous> (/Users/jbd/gcloud-node/node_modules/request/request.js:985:14)
      at Request.EventEmitter.emit (events.js:117:20)
      at IncomingMessage.<anonymous> (/Users/jbd/gcloud-node/node_modules/request/request.js:936:12)
      at IncomingMessage.EventEmitter.emit (events.js:117:20)
      at _stream_readable.js:920:16
      at process._tickCallback (node.js:415:13)

  2) datastore querying the datastore should select projections:
     Error: no matching index found.
      at Request._callback (/Users/jbd/gcloud-node/lib/datastore/index.js:9:12878)
      at Request.self.callback (/Users/jbd/gcloud-node/node_modules/request/request.js:121:22)
      at Request.EventEmitter.emit (events.js:98:17)
      at Request.<anonymous> (/Users/jbd/gcloud-node/node_modules/request/request.js:985:14)
      at Request.EventEmitter.emit (events.js:117:20)
      at IncomingMessage.<anonymous> (/Users/jbd/gcloud-node/node_modules/request/request.js:936:12)
      at IncomingMessage.EventEmitter.emit (events.js:117:20)
      at _stream_readable.js:920:16
      at process._tickCallback (node.js:415:13)