View template directory structures

first reported here https://github.com/airbnb/rendr/issues/48

allows for the following view/template directory structures

given you have a view named `ConditionsIndexView`, the app will now look for view/template files in the following order relative to the view/template directory.

	conditions_index_view
	conditions/index
	conditions/index_view

Similarly, if you have a controller named `MyCoolFeatureIndexView`...

	my_cool_feature_index_view
	my_cool_feature/index
	my_cool_feature/index_view
	my/cool/feature/index
	my/cool/feature/index_view