Rescue when bundler is missing

Here is a potential idea for ensuring that bundler is installed for those who pull down a fresh clone. The basic idea here is that we can rescue a LoadError in ruby if we fail to require in bundler. Then we can just install it for them. Also, we can re-attempt to run the same command that they originally tried. This can stand as a model for the rakefiles of each repo, so I'd like to get it right in one before I work to roll it out to each of the others.