When setting and changing priorities no attention was paid to the
`story_id', which means that no two tasks could have the same priority,
even when belonging to other stories. This creates a weird situation
where the tasks of a certain story would become unmanageable because
there are gaps between the priorities. This could make it seem like
priority changing was impossible.
Replaces restas with ningle. Restas had 2 problem I could not overcome:
1) It would only let me return a status code or a response, not, for
example, a 403 status code with some json. 2) It would not allow me to
place it under a subdirectory.
Both of these problems possibly (likely) have solutions with restas, but
I already found out how to do these things with ningle.
This rewrite is sloppy and messy. The code should be cleaned up soon.
