Weekly upgrades

Upgrade require-handlebars-plugin to 0.8.0 (and handlebars to 1.3)
Use 0.6.0 release version of backbone-associations
Bump patches for Backbone (1.1.2) and RequireJS (2.1.11)
Bump pack for backbone-associations to 0.6.1
Merge pull request #352 from Connexions/upgrades

Weekly upgrades
Merge branch 'master' into editing

Conflicts:
	bower.json
Refactor content models to support removing nodes
Remove debug code
Make toc pages and subcollections removable