Added @method annotations for view helpers

[bramstroker]

I have added @method annotations for all the builtin view helpers, so we can have IDE completion for the view helpers.
This is based on my discussion with Ocramius at StackOverflow. The same thing is already implemented in the AbstractController for controller plugins.

I was not sure if I also need to add the translation view helpers which are located in the zend_i18n package. The zend_view component doesn't have a dependency on zend_i18n so that's why I left them out.

[Freeaqingme]

Thanks for the PR, I like it! ;)

@weierophinney Can you say something wise about the zend_i18n methods? Personally, I'd opt to add those as well, even though they are not a dependency.

[bramstroker]

@Freeaqingme Thanks for merging. Same goes for the zend_form methods.

@weierophinney What to do with the zend_form methods? I prefer to have those in the ViewRenderer as well.

[micheh]

This is very inconsistent. Sometimes you use self::... (which probably cannot be resolved), aliases (e.g. HeadScript::FILE, which some IDEs can't resolve), FQCN (\Zend\View\Helper\Placeholder\Container\AbstractContainer::APPEND) and strings ('APPEND').

[bramstroker]

@micheh: thanks for pointing. it should be all FQCN's. I'll correct things asap.

[bramstroker]

@micheh: Created a new PR to fix this issue. String 'APPEND' is equal to the method declaration, there is no constant for this eighter I think.