Invoker cleanup - Fix AJAX callbacks which misuse '::' notation
Invoker cleanup - Remove dead AJAX callbacks
Invoker cleanup - Move profile() to its own class
Invoker cleanup - Remove unused calling convention.

We'll want to introduce a different calling convention in the future.
Merge pull request #2598 from totten/master-invoker-cleanup

CRM_Core_Invoke - Cleanup weird callbacks. Simplify callback convention.