Update README.markdown

Fix oversight from move to script/install instead of rake install
README; script/install is really script/bootstrap
Merge pull request #64 from ncolton/master

Minor doc update
make sure $PATH is setup first
Source all path.zsh files in the project before the rest
Improve zsh file sourcing.

Now it gets all of the files once, then iterates over three times,
once for path, once for general stuff, once for completion
update the README for special handling of path.zsh and completion.zsh
unset config_files after sourcing everything
Merge pull request #66 from rcarver/source-path-first

make sure $PATH is setup first
Kill completion.sh nonsense
No longer use this script
Merge branch 'master' of https://github.com/holman/dotfiles