Merge pull request #7 from Magrath/master

Pull new .gitignore file
Update README.md

Changed the location to download the toolbar from, to OpenNTF, as it is publicly accessible
Merge pull request #8 from Magrath/master

Pull my fixes for warnings in Compatibility Tests section of Mozilla Add Ons report
Update README.md
Merge pull request #9 from Magrath/master

Pull fixes to menuUtils to use event listeners where they should be used.