Naming conventions

Having moved to a (partial) MVC architecture we should adopt some conventions for naming our models and controllers.

The folks at cakephp (http://book.cakephp.org/2.0/en/getting-started/cakephp-conventions.html#model-and-database-conventions) came up with some nice naming conventions.

I suggest we use these for new concepts we introduce to our architecture.

In short:

- Models are singular: Plugin not Plugins.

- Database tables backing the model are plural, lowercase: plugins, not plugin or Plugins.

- Controllers are plural if they are "directly" backed by a model: PluginsController, not PluginController.

- Controllers are singular if they are not backed by a model: AdministrationController (which we shortened to AdminController)

- Controllers backed by a main model handle most stuff related to that model. This modularization makes it easy to find the code we are interested in when bugs need fixing.

I realize that functionally naming conventions don't have any benefit, however they do increase maintainability. Currently we don't have naming conventions (or I am unaware of them AND they have not been consistently obeyed in the current code base).