Initialize defaults with application identifier.
Merge pull request #13 from tanB/defaults-for-appdomain

defaultsからApplication Identifierを指定して設定を読めるようにしました。
Add MenuItem 'Crop Screen'
release BorderlessWindows when remove them from _window array.
capture screen repeatedly without terminating app.
start selecting recording area at launched
disable select recording area MenuItem, if selecting window exists.
Fixed mismarge.
Add cancelRecording method.
Add delegation method: didPressEscapeKey
startCrop when Dock icon clicked
Fixed mismerge.