Add vim-dispatch for great justice
Ignore .rvmrc

Currently, Pow! doesn't support .ruby-version for setting the current
ruby and uses the system ruby. Because of this, I have to manually
create .rvmrc, which is respected, to properly set that.

There is currently an issue for Pow! to fix this, but it has been
blocked for six months. I may take a whack at it later this week to
allow me to undo this travesty.

https://github.com/37signals/pow/pull/327
Open new splits to the right/bottom

* Feels more natural than Vim's default

Thanks to @adarshpandit for this idea, which I stole from
thoughtbot/dotfiles