Cleaned uneeded Bower dependencies and resolutions
JSDoc + tweaks

- Documented element with JSDoc comment syntax
- Replaced <polymer-ui-card> which is experimental with <paper-shadow>
- card shadow is now more pronounced
- disabledKeys are now more pronounced (lighter)
- when everything has been selected and the focus is DONE all keys are
now disabled.
Set as a reusable component

- .bowerrc trick (see
https://divshot.com/blog/web-components/polymer-and-bower-getting-it-rig
ht/)
- index.html uses <core-component-page> to parse out JSDoc comments
from the element to render a presentation page with attributes and
events...

See
https://www.polymer-project.org/docs/start/reusableelements.html#publish
ing-a-demo-and-landing-page-for-your-element
Remove font-roboto dependency

The robot font is not included in md-timepicker by default.
The element will still use "RobotoDraft" by default if included in your
project. Fallbacks are (in order): Helvetica Neue, Helvetica,
sans-serif.
Css in own file + cleaned Doc
Publicly available via Bower