srcElement -> target
Set position: relative on the <img hero> to ensure that the z-index is honored.
General polish around hero transitions and ripple animations. Better performance in non-Chrome browsers via lazy YouTube API requests.
maxResults -> maxResultsPerRequest in the published attributes list.
Ensure there are enough results loaded initially to trigger scroll bars (so that subsequent results can be loaded via scroll events).
Significantly improve polyfill performance by ditching <paper-shadow>.
Merge pull request #6 from GoogleWebComponents/non-chrome-fixes

Misc. performance/UI improvements