implemented bucket delete REST API
implemented bucket delete REST API

Change-Id: Id15420e93924d93eb407a6381e08b4c6acba6ac8
Reviewed-on: http://review.northscale.com/1579
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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