Cryptfile exception handling

Catch the exception handled by the cryptfile backend of keyring module when enter keyring password. This fix #3 (closed).

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• 0c2aa38b - Use click exceptions instead of `exit`

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• ad4c2ced - Update cli.py

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Thanks @neodarz, I've replaced the exit() call with a raise of a ClickException, as it is will be easier to test (and provide colorized output). Let's merge!

mentioned in commit 19c4b751

merged