~ Name:
~ ~~~~~
~ secret -- Generate a new secret key
~ 
~ Synopsis:
~ ~~~~~~~~~
~ play secret [app_path]
~
~ Description:
~ ~~~~~~~~~~~~
~ Generate a new secret key and update the app_path/conf/application.conf file.
~ If app_path is omitted, the current directory is used.
~
~ Secret key are randomly-generated 64 byte strings, and should be safe enough.
~ 