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CircleCI integration

• Readme fixes for PyPi

• Unittests by provinzkraut
• Travis CI integration
• Vim Arrow keys (jk)
• Also showing error messages with hide_confirm option enabled in select_multiple
• Consistenly crash on keyboard interrupt (Removes prompt_yes_or_no's abort_value)
• Set hide_confirm to default in select_multiple (#9)
• Black code style