Teach checkout to report notifications

[jamill]

This PR is to expose the checkout notification callback through LibGit2Sharp.

[nulltoken]

This comment may not be very appropriate for this type... 😉

[nulltoken]

@jamill Nice! Some small nitpicks, but that's a very nice addition.

While you're at it, could you please take a look at the failed Travis build as well?

[jamill]

@nulltoken Thanks! I made the suggested changes and the travis build should pass now as well (will confirm). I still need to rebase this on top of latest, which I will do shortly.

[nulltoken]

@jamill Last nitpick. Could you please convert the File.WriteAllText() calls to leverage the Touch() method?

[jamill]

rebased on top of latest and converted to use the Touch(...) method.

[nulltoken]

Left over?

[jamill]

@nulltoken Thanks again - updated!

[nulltoken]

@jamill Could you please value this param xml doc?

[jamill]

@nulltoken Updated again. I left the last commit separate - I can squash this commit when necessary.

[nulltoken]

I can squash this commit when necessary.

@jamill Now would be a good time 😉

[jamill]

and squashed

[nulltoken]

and merged

[nulltoken]

and ❤️💥👍🍌‼️