Test failures for having project settings as tuples, and updates (decorators, etc) as strings.
Fixes #40
project settings in the form of CSP_IMG_SRC = ('x', 'y') (a tuple) won't throw a TypeError when trying to use a decorator to update a specific view.
Test case added in 89a66c95c0a58ce9e20500829f5d02421b2aa449 passes.