Add yath shell command

[exodist]

Equivelent to:

yath start
$SHELL
yath stop

Starts yath, drops you into a shell, then calls yath stop when the shell exits.

[rabbiveesh]

Will there be a -c sort of option for this? I would mainly use it to preload and then run all tests once before a release.

[exodist]

@rabbiveesh: What you are describing already exists as the yath test command. Yath test will preload, run all the tests, then exit (if you give it the right flags)