Upgrade dependencies
Update config for require-cs 0.5
Remove dead code
Test that a model exists before trying to retrieve its page
Add support to get a page by id as well as page number
Performance improvements

Avoid using Backbone.Associations' event handling due to performance penalties,
and reduce unnecessary page redraws.
Don't try to load a page if no page exists to load
Match a page to an id with or without a version number
Prerender HTML for performance and fix contextual links
Upgrade grunt-contrib-clean dependency version
Cleanup code spacing
Move scroll and analytics methods into media view
Fix missing page/book toggle
Right-align splash image so the girl is always visible
Merge pull request #615 from Connexions/weekly-upgrades

Weekly upgrades
Replace Help link with Zendesk Ask Us button
Merge pull request #616 from Connexions/collection-context-links

Performance Improvements & Collection context links
Merge pull request #617 from Connexions/right-align-banner-for-small-screens

Right-align splash image so the girl is always visible
Merge pull request #618 from Connexions/zendesk

Replace Help link with Zendesk Ask Us button
Convert header nav to a bootstrap navbar