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
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
Added hydrator strategy doc
Edit typo
Merge pull request #508 from mwillbanks/feature/zendservice-googlecloudmessaging

ZendService\Google
Merge pull request #596 from harikt/patch-1

Edit typo
Merge pull request #571 from bladeofsteel/fix/ru/zend.config-translation

[RU] Zend\Config translation
Fixed typos
Merge pull request #594 from iwalz/hydrator-strategy

Added hydrator strategy doc