closes#276
- settings screen now loads a model when a pane is requested, rather than when the whole screen is requested
- added browse, read and edit methods and routes for users to the API
- added user model & template to client and wired everything up.
- provided default images for cover and profile picture
- Ghost.View now extends Ghost.TemplateView giving all views access to subviews and templates
- Views which implemented templates no longer need to
- Some views needed to re-override render which is a bit annoying
- Settings screen now has sub-templates for each pane and for the sidebar
- Additional Casper tests for settings screen