Mobile app developer Shifty Jelly in a disclosure revealed that Amazon is renegging on developer promises and refusing to pay developers for promos for the Appstore. Although its agreement officially states that it will pay developers 20 percent of the price of an app, Amazon told Shifty Jelly that it would pay nothing at all for promoting Pocket Casts ($3, Android Market) and that the attention from the free giveaway plus highlighted placement was reward enough. While the developer agreed as an experiment, it learned that it would have made $54,805 in one day from t