added google cloud messaging introduction and quick start
Prepare for translation
Translate and actualize introduction
translated 'intro' and 'ini' section
Translate 'theory' section
Translate 'reader' section
Up to last master
phpunit error message relates to *edit* action
translate config writer section
translate processor section
translate factory section
Merge branch 'master' of https://github.com/zendframework/zf2-documentation into feature/zendservice-googlecloudmessaging
Renamed GoogleCloudMessaging to Google\Gcm
Resolved issue where there was still a reference to googlecloudmessaging instead of google.gcm
Add doc for SendResponse
Update to RST syntax
Add doc for MvcEvent
Add trigger information
Fix
Add doc for ViewEvent