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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

agnoster theme was checking if the default virtualenv prompt was turned off and not showing its own... so there was no way to see which virtualenv was selected.