Update to Traceur 0.52

Using the old 0.45 was causing tests to break in Travis.
Merge pull request #226 from matthewp/traceur-52

Update to Traceur 0.52
Updates systemjs

This updates systemjs to the newest that is now in bitovi/systemjs
Updated SystemJS

This updates SystemJS further to be based on the latest
es6-module-loader master with a fix for loader.import sharing promises.