used 2to3 script and fixed some little thing to turn zen-coding into a g...

used 2to3 script and fixed some little thing to turn zen-coding into a gedit3, python3 plugin

Mike, not much work done here, but this makes it work. I couldn't make your plugin work in gedit 3.10, and "gedit zen coding" points to your website all over: can you consider the pull request? Or you can just repeat the process, run 2to3 on each file, and fix the remaining bug manually.