Groundhog now aware of the number of forks of a project. Related to #22
Implementing method to analyze the percentage of projects that have forks. Related to #22.
Tweaking getProjectsWithForksRate to be a static method. Implementing getProjectsThatAreForks, a method for determining how many projects on GitHub **ARE** forks.

This method won't itself perform a search on GitHub's entire database, but it will accept a list of projects and perform the calculations on this given list. Whenever we're able to fetch all projects on GitHub we'll be able to anwser the following question:

'What is the overall percentage of Github projects that ARE forks?'

Related to #22