Support for multiple projects, newer Jira versions and other goodies

Hello there! First of, thank you so much for taking the time in sharing this. I was about to start work you this!

I've made some modifications to the project so it could work with multiple projects and also with the OnDemand Jira version and included a readme for easiness of setting it up and finding it on github which I thought to share back. Feel free to ignore it if it doesn't float your boat.

Again, thanks a lot for sharing! :+1: