Remove lock before check-in

[iamjonatha]

If a file is locked, check-in fails.
Provide an option to unlock files before check-in operation

[jessehouwing]

Sounds like you're using Server workspaces. I recommend you move away from those and use Local workspaces. The new (2.x) agent exclusively uses those, in which case unlocking isn't even an option.

I'd accept a pull request.