placeholder integration of cbdatasource
placeholder integration of cbdatasource

This just copies over the example, memory-only Receiver implementation
from cbdatasource.

couchbaselabs/cbgt,nimishzynga/cbft,steveyen/cbft,couchbaselabs/cbft,nimishzynga/cbft,steveyen/cbft,couchbaselabs/cbgt,couchbaselabs/cbft,nimishzynga/cbft,nimishzynga/cbgt,nimishzynga/cbgt,nimishzynga/cbgt,nimishzynga/cbft,couchbaselabs/cbgt,steveyen/cbft,nimishzynga/cbgt,couchbaselabs/cbft,steveyen/cbft,steveyen/cbft,couchbaselabs/cbft,couchbaselabs/cbgt