Added support for repo URLs prefixed with ssh://

[voidrender]

From the Git Book:

To clone a Git repository over SSH, you can specify ssh:// URL like this:

$ git clone ssh://user@server/project.git

Or you can use the shorter scp-like syntax for the SSH protocol:

$ git clone user@server:project.git

Instead of depending on the url to start with "git@", the checkout type and git service are now determined using NSURL's resourceSpecifier and scheme properties without manipulating the original URL string.

I just noticed that there are small changes to the parse function in #251, but the merge shouldn't be tricky.

[buildasaur]

Result of Integration 1

Duration: 5 minutes and 39 seconds
Result: All 50 tests passed, but please fix 1 warning.

[czechboy0]

Very cool, thanks for fixing it properly and even adding tests! 💯 👍