Upgrade to jQuery 2.0

https://github.com/sakaiproject/3akai-ux/issues/2720

- Upgrade jQuery 1.8.3 to 2.0.0
- Upgrade require 2.1.2 to 2.1.5 (https://github.com/jrburke/require-jquery/pull/9)
- Upgrade ba-bbq from 1.2.1 to 1.3 and remove legacy browser support (https://github.com/cowboy/jquery-bbq/pull/48)
- Remove legacy browser support from ba-hashchange (https://github.com/cowboy/jquery-hashchange/pull/31)