Pass in accept_keyhost and key_file parameters

Pass in parameters to SSH clone a repo. You can find more information on the parameters here `accept_keyhost` and `key_file`: http://docs.ansible.com/git_module.html
I'd actually perfer if the variables where a bit more recognizable as parameters for the git module. `project_git_accept_hostkey` and `project_git_key_file` perhaps?