add reruning script, moved dir creation to separated func, sumodule support #66
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I think it is better to have an option to re-run script multiple times without creating new repo each time. added function chdir_to_repo to automatically clone existing repo and prevent trying to overwrite it's history
also it is possible, that someone could run script after cloning this repo from it's folder, so added functionality to clone repo as submodule, so it will not cause any issues
fixing #67