Logging commit (and/or release) id when in debug mode

[angelhof]

It would be great if PaSh could log the commit and release id when in debug mode. T

This should only be done in debug mode, because we don't want to execute a subprocess call everytime we call PaSh.

[angelhof]

When in debug mode, we could also log important environment information like the locale environment variables (e.g., LC_CTYPE), and the versions of commands.