* adds PHPDoc @return and @param for getters and setters respectively
* addresses changes in PR review
* adds documentation tests
* Update php_generator:
- Prepend \ to names where required
- Remove <pre> tags
- Update protobuf field comments
* Updates class files with the protobuf changes
* Addresses review comments
* removes Protobuf Type line from PHP generated classes
* fixes phpdoc test
* adds array types to phpdoc
12acbc2678