Remove bin directory from ctrlp

The bin directory is created by bundle install --binstubs, and its
contents are really messing up ctrlp's list.
New colorscheme jellybeans to try

This replaces the version in the colors bundle as it is more actively
being worked on:

https://github.com/nanotech/jellybeans.vim
Add Steve Losh's next/prev motions

Steve has created motions to work around the next and previous (he calls
them last as p is already taken) text objects.

Gist is here: https://gist.github.com/3762227