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Some environments (such as Android) does not have /usr/bin.

Apparently, it is possible to set up a Mac such that
`scutil --get ComputerName` hasn't been set.

This change checks if that fails and falls back to the original
mechanism.

Closes #2155
Closes #2183

This allows customization via .zshenv if wanted. This is helpful
for zsh developers and people who want to move it out of $HOME

This will prevent lots of subtle problems that happen when
people upgrade ZSH or use NFS mounted home directories.

The ZSH_COMPDUMP variable can also be used to implement `zcompile`
and other fun features in the future.

oh-my-zsh.sh now also checks for $ZSH_CUSTOM/themes/$ZSH_THEME.zsh-theme when attempting to load a theme. This way custom themes can be a bit more organized in the 'custom' dir

`config_file` variable will mess up with `cd` auto-complete command.

eg. I have a local dir named `Code`, and when I type `cd co<Tab>`,
config_file will show up, and doesn't make any sense...

    `(.)` search only real files.
    The deletion of it enables searching symlink *.zsh files

This seems like a simple oversight, everything else uses `$ZSH_CUSTOM`
rather than `$ZSH/custom`.

The addition of `(.N)` enables the `NULL_GLOB` option which suppresses
the error output in question.

Reference: http://www.zsh.org/mla/users/2004/msg00621.html

* also normalized style to match the guide.

Custom plugins weren't being added to the fpath correctly.

Fixes #549. Specify ZSH=$ZSH explicitly when invoking
the auto update scripts.

just set ZSH_CUSTOM in your .zshrc, if not set oh-my-zsh.sh will
use the default custom dir in the repository

    #395 broke oh-my-zsh for users who disable check-for-updates

 - themes array is 1-based

 - theme files names are located in indicies 1 through N inclusive

 - this resolves an issue where you would occasionally see: "no such
   file or directory. Random theme '' loaded..."

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

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.