Add Max-Age or Expires if either one is set
Check values with .startswith() because of changing values

Since expiration changes based upon utcnow() and whatnot we can't easily
test it.

However, in the future we may need to add a way to make it more testable
...
Add more tests for make_cookie

Since we copied the function from a future WebOb ... we want to make
sure that we test it.
Fix python 3.x tests
indentation