Add "priority" to subscription editor.
Feed priority through "Download Podcast" logic.
Push priority into ContentService. Not functional.
First working priority (not yet working with podcast-order.txt).
Functional priority (incl. ordering).
Code review, mainly comments.
Merge pull request #98 from smblott-github/priority

Priority subscriptions.
Better ordering of priority podcasts.
Fail safe.
Better wording for priority on subscription editor.
Merge pull request #99 from smblott-github/priority

Better ordering of priority podcasts.