Add bgnotify plugin, a cross-platform background notifier!

plugins/bgnotify/README.md

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+# bgnotify zsh plugin
+
+cross-platform background notifications for long running commands! Supports OSX and Ubuntu linux.
+
+Standalone homepage: [t413/zsh-background-notify](https://github.com/t413/zsh-background-notify)
+
+----------------------------------
+
+## How to use!
+
+Just add bgnotify to your plugins list in your `.zshrc`
+
+- On OS X you'll need [terminal-notifer](https://github.com/alloy/terminal-notifier)
+  * `brew install terminal-notifier` (or `gem install terminal-notifier`)
+- On ubuntu you're already all set!
+
+
+## Configuration
+
+One can configure a few things:
+
+- `bgnotify_threshold` sets the notification threshold time (default 6 seconds)
+- `function bgnotify_formatted` lets you change the notification
+
+Use these by adding a function definition before the your call to source. Example:
+
+~~~ sh
+bgnotify_threshold=4  ## set your own notification threshold
+
+function bgnotify_formatted {
+  ## $1=exit_status, $2=command, $3=elapsed_time
+  [ $1 -eq 0 ] && title="Holy Smokes Batman!" || title="Holy Graf Zeppelin!"
+  bgnotify "$title -- after $3 s" "$2";
+}
+
+plugins=(git bgnotify)  ## add to plugins list
+source $ZSH/oh-my-zsh.sh  ## existing source call
+~~~
+