docs(demo): better example and clearAll

 * Adds a clearAll button to clear the stored values
 * Does not wipe out the stored value on page load
 * Some web updates to the template
 * Use Github hosted version of plugin
 * Removes annotated code (ng-annotated or another tool should be used
 * to get rid of human error)

Fixes #87
Merge pull request #180 from eddiemonge/demo

docs(demo): better example and clearAll