Minor update to Instapaper Beyond (1.4)

Instapaper Beyond¹ users will want to type "U" in their Instapaper SSB² to update to version 1.4. It includes a minor update that improves bottom-of-page detection when using the spacebar.

Styled after Google Reader and others, when the spacebar is pressed at the bottom of an article, it loads the next article. I'm trying a better selector to detect the bottom of the page, which should prevent false jumps before you finish reading your article.