removed payload from incoming json requests

[josephmancuso]

This PR fixes the weird payload input that is required to get the request inputs for incoming json requests.

Previously we had to do this:

def show(self):
    request().input('payload')['some_input']

now we just straight up grab the input we need:

def show(self):
    request().input('some_input')

[coveralls]

Coverage decreased (-0.09%) to 91.333% when pulling f3c598a on fix-json-request into 0263343 on develop.