Script Summary: Add a button to fetch the word count of saved Instapaper articles
Adds a button that says 'WC' next to the 'Text' and 'Archive' buttons in InstaPaper's screen.
When clicked it fetches the text version of the page you've saved, counts up the words in the content of it and updates itself to display the word count.
Reworked small portions to make it compatible with some layout changes at Instapaper. Ought to be a little bit faster as well.