Add Vim text objects: Folds
Better Vim key binding to disable search highlight
Add ~/.dotfiles/bin to path instead of symlinking
Setup rbenv during install instead of as submodule
Disable zsh command correction properly
Setup rbenv path separately
Change location of Vim's temporary directory
Aliases for loading Vim with sensible defaults only

In case one ever needs to load Vim with little to no customizations, but
still get a few goodies that interfere as little as possible with the
defaults while providing some comfort.  The sensible defaults are of
course provided by @tpope's vim-sensible plugin
(http://github.com/tpope/vim-sensible), which was introduced in commit
f882437.
Organize code in install script

- Group installation steps logically.
- Hide standard verbose output from git commands.
- Provide better messages to the user throughout the process.