`git-symbolic-ref` needs to be `git symbolic-ref`

 * Improved speed, the first time cd'ing into a git repo the prompt
   returns much faster (for me at least).
 * Prompt is now decorated in nested folders within a git repo. No
   longer check for the '.git' folder.

 * git.zsh is now themable:
   * git_prompt_info() now will look in the following variables for
     formatting strings:
     * ZSH_THEME_GIT_PROMPT_PREFIX - Prefix for the prompt (before the
       branch name)
     * ZSH_THEME_GIT_PROMPT_SUFFIX - The very end of the prompt
     * ZSH_THEME_GIT_PROMPT_DIRTY - Displayed when the branch is dirty
     * ZSH_THEME_GIT_PROMPT_CLEAN - Displayed when the branch is clean
 * Updated geoffgarside, robbyrussell, and maran to work with new git
   theme
 * Added the Risto theme, which is very similar to a number of bash
   prompts, and allows me to use zsh in with out my co-workers knowing I
   have the advantage. Think of it as a ninja theme.

Updating the name of the rake and capistrano task cache file to append a ~ to the end of the filename so it's easier to ignore in rails git projects. [#1]

Updating install process to copy your current environments PATH and adding it to the bottom of ~/.zshrc.

Moving the loading of all .zsh files into a different file so that we can remove zshrc from the repository

Adding theme support so that people can share their zsh prompts with others. Users can set which theme to load in zshrc now.