Add some nice admin queries to psql and tweak formatting

Thanks @datachomp !

https://github.com/datachomp/dotfiles/blob/master/.psqlrc
Remove the explicit window resize on move in Vim
Clean up PATH definition & remove ./bin from path
Add script for creating a Mavericks installer
Update ruby/rails/testing plugins
Remove mutt sidebar configuration
Tweak psql settings
Stop automatically setting winheight
Cleanup PATH management

- use .git/safe/../../bin instead of adding ./bin to path