avoid inserting resource root param on json requests

Strong params will fail when there is an unkonwn parameter so all requests should contain a root node representing the resource in question, e.g. { subject: { param_1: 'x', param_2: 'y'} }.
avoid duplicate index route and override
add spec for json wrap_params
Merge pull request #10 from camallen/edpaget-fix-502-queued-bug

fix strong params error on subejcts cellect route