rendering refactoring to rely on a property to init_subviews at render time
views for rendering sets statically, no context yet
remove angular day script
render set props
render set number if index is supplied
add boilerplate test for set collection
should display sets using a setFilter
missing import
lay ground work for adding a training session page
- refactor navigation link
- create concept of traits for backbone views

needs testing for trait and extend_trait
refactorings:
- extract P.View to its own file
- make extend_trait the view class method trait()

+ added tests for trait()
don't always replace the url with the navigate trait
+ add some tests to the Navigate trait