1. Using proper polymer events for loading.
2. Fixed proxy control flow to avoid letting 404's through.
3. Removed polymer HTML imports shim.
4. Explicit loading order for ceci components.
5. upgraded polymer to most recent on git for FF compatability (NEEDS ATTENTION)
cleaned up some code left over from debugging
Merge pull request #997 from secretrobotron/polymer-upgrade

1. Using proper polymer events for loading.