update test to document a user was created
tweak managers to be more forgiving and reusable
get information about categories and tags
document how many queries it took
add ability to associate posts with taxonomy
add test coverage for get_or_create_from_resource method
refactor post's get_or_create_from_resource to use common logic
refactor resource_list method to move it into the base
add a .fetch method to posts
add ipython notebook files to gitignore