The unifiedpush server supports registration for multiple categories.

The client SDK needs to reflect that change.

For JS, that is mainly just a documentation issue:

• https://github.com/aerogear/aerogear-js/blob/master/src/unifiedpush/aerogear.unifiedpush.js#L37
• https://github.com/aerogear/aerogear-js/blob/master/src/unifiedpush/aerogear.unifiedpush.js#L71