Add rbenv command that makes "rbenv shell" work
Prompt is a fish when last command exited successfully, and a sushi otherwise
Add ka: Kills All jobs
Add sib-rbenv, puts a shell into the rbenv environment I'm using for SiB

The ruby version is 2.0
The gemset is a file containing sib
Add bin/fn, a binary for finding files under the current directory that match a given name