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Fixes a bug where color of status arrow in prompt is red even when the exit code was zero (or success). This fix correclty returns green arrow on success and red for non-success exit code.

This avoid spawning additional processes, as the $USER variable will
**always** contain the current logged-in user.

This stops the virtual env name from being printed before it is actually being
used in the zsh prompt.

Fix "command not found: add-zsh-hook" since #3053 removes `autoload -U add-zsh-hook`

Not everyone uses rvm and the library has already got a function for this.

Add spaces before bullet-points to more easily distinguish them from one another and the rest of the prompt when using smaller font-sizes and do not add a blank line prior to prompt output; if there's a desire for spacing, one can use their terminal's line-height to achieve this.

Fixes #2008.

<B> Designates Bisecting
>M< Designates Merging
>R> Designates Rebasing

re-implemented expired pull request https://github.com/robbyrussell/oh-my-zsh/pull/1759

changed ± to 

clearing up some confusion in issue#1906