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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.

Unlike all other files listed in the themes directory, this file is the only
one that's "doing it's own thing"

See http://www.virtualenv.org/en/latest/index.html\?highlight\=virtual_env_disable_prompt\#activate-script for info regarding this.

This reverts commit baffc3b0.

Made it work with UTF-8 Console.
Thanks goes to http://blog.ganneff.de/blog/2013/03/zsh-config---and-prompt.html

The code points have been updated in 53fbfe1, see
- https://github.com/Lokaltog/powerline/commit/53fbfe15fead8cc7598bcb4ee9714a221ab7e446
- https://github.com/Lokaltog/powerline/issues/4

I created a theme that I feel confortable with and want to share with
everyone.

The prompt format is: <user>@<host> <current_dir> (<git_status>)$

hostname -s is not available on every implementation of hostname, e.g. Cygwin uses hostname from coreutils which doesn't work.