Fixes for oldIE including quotes around delete keyword and a number of polyfills.
Add an external event dispatcher hook that can be used to dispatch events outside of Polymer. For example, using jQuery's special event system
oldIE: Make some adjustments to the two samples that could potentionally work in oldIE (no canvas usage)
oldIE: document.head doesn't exist in oldIE, use oldschool DOM APIs instead
oldIE: Make the event creation work in oldIE, skipping event.buttons with TODO comment
oldIE: Use srcElement in place of target event property