bravado should be able to parse errors as json

[bpicolo]

Along with the idea of uniform exceptions, we definitely expect errors to come back with JSON responses in, well, most all occasions in our own apis.

Bravado should be able to parse exception messages that are json. Otherwise taking any action on them is virtually impossible.

Here's an example from (swaggerpy):

(Pdb) e
HTTPError(u'403 Client Error: Forbidden : {\n "error": {\n "code": "FLAGGING_FORBIDDEN", \n "description": "You can't flag this."\n }\n}',)
(Pdb) e.message
u'403 Client Error: Forbidden : {\n "error": {\n "code": "FLAGGING_FORBIDDEN", \n "description": "You can't flag this."\n }\n}'
(Pdb) e.request
(Pdb) e.response

Probably doesn't help that error request/response are empty.
I can't even json.loads it myself because we stuff the status code in there. : (

[bpicolo]

Fyi, going to cut a branch to fix this in swaggerpy (because it's a necessary requirement for me)

[analogue]

The same work to expose the the request/response on HTTPError needs to be done for bravado on the master branch.