Init shell should run script in HOME

[egranata]

Init shell (aka, the shell spawned by init) currently runs /system/config/shell.sh which is fine behavior.

It is arguable (as in, it can be reasonably argued) that the user should also be able to drop a file in /home and have that file run for an init shell - that would allow user customization of the environment without tampering with the system's own configuration data

This goes hand-in-hand with #160