Initial stub of mb_grid module.
Initial stub of mb_grid module.

Change-Id: I61136ea328d8edfff2ce651ea0367cc054aab08e
Reviewed-on: http://review.membase.org/4560
Tested-by: Sean Lynch <e07ca8b5c22e6f6609daf94a8bc7d7ee0eb3f49b@gmail.com>
Reviewed-by: Sean Lynch <e07ca8b5c22e6f6609daf94a8bc7d7ee0eb3f49b@gmail.com>

nimishzynga/ns_server,nimishzynga/ns_server,daverigby/ns_server,ceejatec/ns_server,ceejatec/ns_server,vzasade/ns_server,ceejatec/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,membase/ns_server,ceejatec/ns_server,mschoch/ns_server,mschoch/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,vzasade/ns_server,membase/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,mschoch/ns_server,nimishzynga/ns_server,ceejatec/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,membase/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,membase/ns_server,pavel-blagodov/ns_server,membase/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,membase/ns_server,daverigby/ns_server,mschoch/ns_server,daverigby/ns_server,nimishzynga/ns_server,t3rm1n4l/ns_server,daverigby/ns_server