add `weave stop_proxy`
add `weave stop_proxy`

Closes #754.

n054/weave,ycaihua/weave,paulbellamy/weave,achanda/weave,weaveworks/weave,2opremio/weave,BWITS/weave,squaremo/weave,BWITS/weave,paulbellamy/weave,cgvarela/weave,squaremo/weave,2opremio/weave,tomwilkie/weave,n054/weave,cgvarela/weave,kidaa/weave,tomwilkie/weave,aaam/weave,OnePaaS/weave,rade/weave,narry/weave,OnePaaS/weave,inercia/weave,OnePaaS/weave,rade/weave,narry/weave,paladin74/weave,awanke/weave,inercia/weave,paulbellamy/weave,errordeveloper/weave,aaam/weave,narry/weave,narry/weave,errordeveloper/weave,dpw/weave,beni55/weave,weaveworks/weave,achanda/weave,OnePaaS/weave,squaremo/weave,inercia/weave,weaveworks/weave,philipz/weave,BWITS/weave,beni55/weave,errordeveloper/weave,rade/weave,dpw/weave,dpw/weave,n054/weave,n054/weave,awanke/weave,tomwilkie/weave,rade/weave,awh/weave,philipz/weave,errordeveloper/weave,bboreham/weave,philipz/weave,awh/weave,paladin74/weave,BWITS/weave,tomwilkie/weave,kidaa/weave,philipz/weave,awh/weave,narry/weave,beni55/weave,2opremio/weave,kidaa/weave,cgvarela/weave,OnePaaS/weave,paladin74/weave,rade/weave,awanke/weave,awh/weave,aaam/weave,bboreham/weave,n054/weave,cgvarela/weave,bboreham/weave,dpw/weave,ycaihua/weave,bboreham/weave,2opremio/weave,BWITS/weave,2opremio/weave,bboreham/weave,achanda/weave,errordeveloper/weave,squaremo/weave,philipz/weave,paladin74/weave,achanda/weave,awanke/weave,inercia/weave,cgvarela/weave,aaam/weave,beni55/weave,kidaa/weave,awh/weave,paladin74/weave,ycaihua/weave,achanda/weave,squaremo/weave,awanke/weave,ycaihua/weave,inercia/weave,ycaihua/weave,weaveworks/weave,beni55/weave,aaam/weave,tomwilkie/weave,dpw/weave,paulbellamy/weave,kidaa/weave