Bugfix/git shortcuts

Hello,

After installing Git with Chocolatey, I was quite disturbed by the fact that its various shortcuts were not installed by default. As I believe that such a behavior is not an acceptable default setting for the masses, here is my pull request containing the related changes.
Yeah, that seems like it would be fine. I don't know how much I would like to stray out of the default install I would like to go though.

Perhaps we look at the packageparameters pattern? https://github.com/chocolatey/chocolatey/wiki/How-To-Parse-PackageParameters-Argument