Add linux user startup for srworker

This is a desktop file to be loaded when the user logs in (placed in
~/.config/autostart) which will run the python file, which in turn
spawns a terminal that runs the worker inside it.
Add OS X user startup for srworker

The srworker launch plist (which needs to be moved from system-wide to
user-specific location) has been modified to open a .command file. This
will cause a terminal to be spawned when the user is logged in, running
the contents of that .command file as a shell script. In this case, it
sets the python path and launches srworker inside the terminal.