Core Elements Working

I got the polymer <core-elements> working.  I have to compile to JS and include the components in index.html.
The result is a very crowded index.html.  I would prefer to compartmentalize the components and pass data through.
Having to place all the <core-elements> in index.html also makes styling the components difficult.  Components styles can be encapsulated.  Styling the page can be broken down into segments.  With all the <core-elements> living in index.html, the styling is universal.