Removed no longer actual TODO
Merge branch 'upstream/master'
External CSS for widgets

Not 100% as we intended, because <link rel="stylesheet" ...> still doesn't work for Polymer elements, but pretty close by using `<style> @import(); </style>` trick.
Merge pull request #680 from ussuri/external-css-in-widgets

External CSS in widgets
peg the version of cipher that we use
Merge pull request #687 from dart-lang/devoncarew_cipher

peg the version of cipher that we use
merge to master