Latest processing update

Processing has been updated, quite a few fixes, tested on linux with ruby-processing and it seems to make sense to update your version of processing for use with ruby-processing, just make sure you update the processing root in .rp5rc, to ensure you are using the right version.

Processing 2.2.1 fixes all the things I broke at the last minute in 2.2. Changes: https://t.co/f8ZQYywL5R. Download https://t.co/bF4kqfcSGy

— Ben Fry (@ben_fry) May 20, 2014