made some method name changes to have a better coherence throughout the framework

When an object has a "main" many relation with related "things" (objects,
parameters, ...), the method names are normalized:

 * get()
 * set()
 * all()
 * replace()
 * remove()
 * clear()
 * isEmpty()
 * add()
 * register()
 * count()
 * keys()

The classes below follow this method naming convention:

 * BrowserKit\CookieJar -> Cookie
 * BrowserKit\History -> Request
 * Console\Application -> Command
 * Console\Application\Helper\HelperSet -> HelperInterface
 * DependencyInjection\Container -> services
 * DependencyInjection\ContainerBuilder -> services
 * DependencyInjection\ParameterBag\ParameterBag -> parameters
 * DependencyInjection\ParameterBag\FrozenParameterBag -> parameters
 * DomCrawler\Form -> FormField
 * EventDispatcher\Event -> parameters
 * Form\FieldGroup -> Field
 * HttpFoundation\HeaderBag -> headers
 * HttpFoundation\ParameterBag -> parameters
 * HttpFoundation\Session -> attributes
 * HttpKernel\Profiler\Profiler -> DataCollectorInterface
 * Routing\RouteCollection -> Route
 * Security\Authentication\AuthenticationProviderManager -> AuthenticationProviderInterface
 * Templating\Engine -> HelperInterface
 * Translation\MessageCatalogue -> messages

The usage of these methods are only allowed when it is clear that there is a
main relation:

 * a CookieJar has many Cookies;

 * a Container has many services and many parameters (as services is the main
   relation, we use the naming convention for this relation);

 * a Console Input has many arguments and many options. There is no "main"
   relation, and so the naming convention does not apply.

For many relations where the convention does not apply, the following methods
must be used instead (where XXX is the name of the related thing):

 * get()      -> getXXX()
 * set()      -> setXXX()
 * all()      -> getXXXs()
 * replace()  -> setXXXs()
 * remove()   -> removeXXX()
 * clear()    -> clearXXX()
 * isEmpty()  -> isEmptyXXX()
 * add()      -> addXXX()
 * register() -> registerXXX()
 * count()    -> countXXX()
 * keys()

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