Update the services Part

[TavoNiievez]

Just to be consistent, the services part is updated, which is the only one documented (and useful?).

The email part was never documented (or used?), so that excess annotation is removed as well.

[Naktibalda]

I guess you have a good answer to question why we need parts.

The idea for exposing a few methods via parts was to make them available when Symfony application is being tested using PhpBrowser or WebDriver.

Most of your new parts only make sense for functional testing using Symfony module.
Using those parts would hide all methods provided by InnerBrowser.

[TavoNiievez]

Ok, I know that some people use the services part in unit tests, and since it is the only Part that was documented up to now, it is the only one that I will update and maintain for version 2.0, thank you very much for your feedback.