add failing test
formalize the test
return an empty MultiDict if args don't exist
fix #54, allow marshal_with to be used with responses that are tuples of (data, code, headers)
Don't clobber app error handlers for non-API endpoints
kill parens in return values
Merge branch 'master' into error_handling
Refactor logic to be slightly more readable

Also add a test to ensure the code does what we want
also use FR error handler if a 404
Merge empty-400-500 into master
add catch_all_404s flag, and add a test for the behavior
ignore w801 errors in analysis
Merge branch 'master' into error_handling
Update a few documentation things
make some more doc links work
fix more docstrings
Bump version to 0.2
add 0.2.0 changelog
make it a markdown file
link changes authors, and add them to AUTHORS