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Fixes #5741

Clarify random theme setting, in particular how to know
which theme was loaded if picked at random.

Updating template and README to list plugins on individual lines vs one long one. Easier scanning for you and me.

See robbyrussell@b67961d

 - Adding documentation
 - Note the effect empty array
 - Fix spelling
 - Using new test `[[...]]`

Sourcing oh-my-zsh immediately after export PATH.

By convention, user-specific aliases are kept in each user's .zshrc
file. The .zshrc template provided by oh-my-zsh has an area for example
aliases, though these were being loaded before other aliases in libs, plugins,
and themes. As a result, personal aliases could be overwritten by these
other aliases as they are loaded. To make personal customization easier, the
sample aliases section of the .zshrc template has been moved to the area
dedicated for personal customization. This section of the configuration
is processed after all other items are loaded, preventing personal aliases
and exports from being inadvertently clobbered by oh-my-zsh.

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