Remove require_once for ZF classes

Skipped require_once for autoloader
Rename zend.pdf to zendpdf for non english docs
Fix a lot Zend underscore class names to namespace
[zendservice] join Zend_Service, Zend\Service and zend.service

Files renamed too.
Fix a lot Zend* (components) with underscore class names to namespace
[zendservice] duplicate class name in namespace

Duplicate class name when only the namespace has 2 spaces. This fix most of the examples
Merge branch 'hotfix/sphinx-syntax-fix' of https://github.com/Maks3w/zf2-documentation into hotfix/#1080
Merge branch 'hotfix/#1080'

Close #1080