Modifications to PHP Opencloud

These changes update the formatting to fully match PSR-2, and also update the docblocks to be more descriptive.

I also updated the `CertificateMappings::updateJson()` method to be more efficient. Compare to `LoadBalancer::updateJson()`.
The only reason I think it shouldn't be ```$id``` is because the LoadBalancer class has a variable called ```$id``` although that would be referenced by ```$this->id```. I'm honestly fine either way, and I'll leave it up to you for best judgment call.