Toolbar icons (closes #10), ui.chat -> backbone.view

Toolbar icons (#10)
- mobile specific parts to be addressed later on
- Sized at 24x24
- Text removed permanely via display: none in a separate span

ui.chat
- Converted to ChatView, a subclass of the new SectionView
- Reformatted to look like traditional double closure

SectionView
- Nifty bit of code in initialize that binds internal methods to this