use homebrew cask to replace installed apps

pip2 install -r requirements.txt
python2 brew_cask_replacer.py

• skip {application} from Appstore [-f turnoff]
• check http://raw.github.com/caskroom/homebrew-cask/master/Casks/{application} is exist
• print application info and check if you want to replace it with brew cask [-y yes to all]
• install application using 'brew cask install {application}'
• send {application_path} to trash (may fail)