Allow customisable indent level
use default-tab-width for backwards compat
Adding a customisation group for pig interaction
Basic pig interaction (start a process, etc)
Need to send newline character to flush an eval
Pop to buffer, instead of switching to it
Keybindings (should be fairly standard)
Merge pull request #6 from markhepburn/interact

Comint mode for pig - local mode only for now
Merge pull request #5 from endform/customisable-indent-level

Customisable indent level