Since we're now able to install Solarized on iTerm2, there's no
need for approximating the theme when using vim instead of
mvim. In fact, using csapprox on iTerm2 with solarized installed
breaks the theme completely.
It seems that the mapleader has to be defined before vundle starts
to load the plugins. For this reason, I moved it from yadr-keymap
back into the vimrc. I'm sure it's not a big deal having the leader
mapped under the "general config" instead of inside settings.