Change GitHub API method names

I believe that the method names for the latest addition in #151 were really badly chosen (by me) and are not in line with the rest of the API.
So, since we haven't tagged v1.0 yet, I thought a small API change could be possible.

**2)**
I was not able to run the unit tests for the GitHub package "standalone" (nor any other package) after #102 was commited. The reason being that the path to the autoloader file in every phpunit.dist.xml file is relative.
So if you `cd` into the directory and run `phpunit`, the file would not be found. Even if you run `phpunit` from the root directory, specifying the package phpunit.dist.xml as the config file, the tests wont run.

So I changed the path in the config.dist.xml file for the GitHub package to be able to execute the tests.

Would you mind to explain what I am missing here and how the tests are supposed to run ?