Add verify_ssl and proxy_address bundle options.

This will allow setting these options on the HipChat service.
The HipChat package requirement in Composer is updated to dev.
This is needed because the verify_ssl en proxy options are not present
in the latest stable tag.
Perhaps the actual loading of the configuration provided should be done in each test case, and then just have the parameter check in this method?

That would, in my opinion, make a more clear test of the configuration parsing and extension loading.

What do you think about that?