Normalize in/out decorators

[rmallols]

At the moment the inDecorator / outDecorator mechanism looks wierd:

• inDecorator uses to return 'query' but I think it's actually returning 'req' if the method has not actually defined. I guess it should return always 'req' as we started to draft on the item creation (app.post...)
• The name of the inDecorator method is called 'filter', but this is strange for instance on user creation, as we are not filtering but encrypting the password.
• outDecorators must be checked as well.
• Please check whether the current implementaton of the find options (read.js -> _getNormalizeFindOptions) works fine, as I have the feeling if you specify any of the custom properties (query, projection, sort...) this is never going to work