Firefox drag & drop bug fix.

• Addresses issues #23 where drag and drop events do not fire on Firefox. Thanks @Ledivin for the PR.

Polymer 1.x/2.x hybrid element support

v1.2.0

Polymer 1.x/2.x hybrid support

Design Refresh

• update default colors to separate out px theming
• component redesign
• update dependencies, colors, and icons for design refresh
• use app-localize-behavior for localization

v0.0.1

Initial release