Made some api changes that improve consistency and usefulness of thev…

…alidation and error generation process, alowing it to be split in amore logical manner.

Breaking changes include:
* validate method now only returns failure or success, instead of success val with errenous nodes
* state serialization (render,render_json) only returns the the serialized pattern (json or html). This is convenient because it can be invoked at the return call from a view
* removed the update success function because it was essentially a bandaid for this problem
* unified the _gen_validate to all be in validate proper.
* success_header_generate does not operate in the same way, and is now only for return actions from json_render
* error_header_generate is essentially the same, except is should never return anything and doesn't recieve block anymore
* Changed the block key in json response to success for js library interaction