Disable security component when it's active

As we receive postback from 3rd authentication providers we have to disable the security plugin in case that app is using the component
Merge pull request #20 from krolow/disabling-security

Disable security component when it's active
Handle 3rd-party plugins that expect a modelClass for all controllers

The CRUD controller currently expects this sort of authentication logic to exist within a Controller, not a plugin Controller that has no models. Forcing `$this->modelClass = null` in the `__construct()` is the only way to do this.
Merge pull request #32 from josegonzalez/patch-1

Handle 3rd-party plugins that expect a modelClass for all controllers
Merge branch 'master' of https://github.com/uzyn/cakephp-opauth

# By Jose Diaz-Gonzalez (1) and Vinícius Krolow (1)
# Via U-Zyn Chua (2) and Jose Diaz-Gonzalez (1)
* 'master' of https://github.com/uzyn/cakephp-opauth:
  Handle 3rd-party plugins that expect a modelClass for all controllers
  Disable security component when it's active

Conflicts:
	Controller/OpauthController.php
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