It is important to note using dev path will cause some cross platform issues because you’ll end up with a hard coded path.
To avoid this you can copy the application into the [YOURCONFIGNAME]/install/apps/manual/ directory and use:
Further reading on manual install: https://toolkit.shotgunsoftware.com/entries/23797786#Apps%20in%20git%20%28and%20github%29
APPLICATION INSTALL NOTES:
You must have the python-api installed for shotgun!
You must uncomment and change the lines in the app.py file to be the correct information for your shotgun setup!