Feature final actions merged to the master branch

[gurhub]

• Added support for FinalActions (https://github.com/gurhub/surmagic/issues/11)
• Default FinalAction in Surfile is the openDirectory (It was the default behavior for previous versions)
• After updating the surmagic you might lose open directory support after running the "surmagic xcf" command. To add support for it, you can use FinalAction in the surfile. Please check the README
• Or, if you don't prefer to open the directory after "surmagic xcf" command, you can remove FinalAction for openDirectory