jish/pre-commit — pull request #36 by libo (2012-08-10 08:16:38+00:00)
Title: Detect if pre-commit is actually installed in the ruby we are using.

When a user has RVM she might have managed to install pre-commit using an other ruby
then the default one. We must check that we have pre-commit in the ruby we are
running pre-commit from.

cc: @jish @shajith