add cygwin windows support with notifu, add to readme

plugins/bgnotify/README.md

@@ -13,6 +13,7 @@ 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!
+- On windows you can use [notifu](http://www.paralint.com/projects/notifu/) or the Cygwin Ports libnotify package
 
 
 ## Configuration
@@ -36,4 +37,3 @@ function bgnotify_formatted {
 plugins=(git bgnotify)  ## add to plugins list
 source $ZSH/oh-my-zsh.sh  ## existing source call
 ~~~
-

plugins/bgnotify/bgnotify.plugin.zsh

@@ -35,6 +35,8 @@ bgnotify () {
     terminal-notifier -message $2 -title $1
   elif hash growlnotify 2>/dev/null; then #osx growl
     growlnotify -m $1 $2
+  elif hash notifu 2>/dev/null; then #cygwyn support!
+    notifu /m "$2" /p "$1"
   fi
 }