Using POST rather than PUT because SecurityToken->checkRequest()
doesn't accept PUT data (it's only in the request body, not
in $_POST and HTTPRequest->requestVars()).
Renaming state operations from 'campaign' to 'record'.
Implemented API endpoint retrieval of GridField data.
Added more mock data into CampaignAdmin (rather than hardcoding in client),
to be replaced by CampaignAdmin API endpoint querying the real datamodel.
Using more native isomorphic-fetch instead of jQuery.ajax
to minimise dependencies and get into a more forward-thinking API.
Also catching errors in ReactJS API backend:
Emulate jQuery.ajax() behaviour. Might change at a later point
if we have a general purpose backend with a promise-based catch()
implementation.
Keyed by URL instead of anonymous object maps which need to be iterated on
Removed the 'schema.forms' namespace, unnecessary since all 'schema' items should be forms
Remove once we have a schema-driven GridField in place.
Edit form should be a GridFieldDetailForm, but there's more work to do for schema generation
from this component.
