Add check of attached wires for http response nodes
Add check of attached wires for http response nodes

Fixes #17
Prevents swagger generation for any nodes that do not have a full rest
flow.

ddm/node-red-node-swagger,node-red/node-red-node-swagger,node-red/node-red-node-swagger,ddm/node-red-node-swagger,lostinthestory/node-red-node-swagger,lostinthestory/node-red-node-swagger