Why files created by Kaleidoscope App are in quarantine?
The system's quarantine feature is a good security measure so I would not recommend this to everyone, but if you are confident in the files you download and run on your system then one option is to disable quarantining altogether. To do this, open the Terminal and run the following command, then reboot the system:

defaults write com.apple.LaunchServices LSQuarantine -bool NO


source: http://www.cnet.com/news/workarounds-for-quarantine-bug-in-os-x-lion/