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Since commands auto-correction must be explicitly enable with
the ENABLE_CORRECTION envvar, this commit replaces the unaccurate
example in the zshrc template.

Although the zshrc template adds a PATH= string, this is overwritten by the installer script.
This allows it to be placed anywhere in the file instead of having to append at the end.

Previously they did not make sense nor were they accurate.

In this commit, the option only works for git but it should not be to hard for
someone who knows svn to so the same.
This commit is largely inspired by @yoavweiss, I only added an option to use
it.

Example aliases allow for an easier way to open ZSH config file/folder
in Textmate. New theme is mh.zsh-theme.

After a few weeks of using this, I'd prefer this to not be enabled by default. My bad for suggesting that in the first place.

This reverts commit fc49b4a4.

Feature: Random themes now supported. Just set your theme to 'random' and it'll load a different theme each time oh-my-zsh is started. Closes #309

These variables are only used by oh-my-zsh, so there's no need
to populate the environment of all children with them.

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

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