AF Cookie should be reused within the context of same request.
Fixes issue #959
Fixing af tests which are failing due to hardcoded values of the tokens.
Limit the maximum number of Model errors to a reasonable value.

Fixes #490
Fix for codeplex-1120 - Move CreateSerializer out of the base class

This is a small refactor as a precursor for api-explorer work.
Adding Api Explorer
Adding functional tests