Prevent an infinite loop when the trimmed text is shorter than the condensed length

[eventualbuddha]

When the contents of the element are only text (clone.html().length == clone.text().length) and the substring is as long as or longer than the condensed length (loc >= opts.condensedLength) and the trimmed body is shorter than the condensed length (clone.text().length < opts.condensedLength), then delta will be zero and the do/while loop will be stuck in an infinite loop. Here's an example where this reliably happens:

<div id="demo">
              I wandered around the streets interviewing people and filming the sights on the day of the Royal wedding, I've never seen so many Union Jacks.

              Shot at 50fps using a Canon 7D, and because I didn't have my sound device I also used it to record the audio, holding it on the end of the tripod like a microphone.

              Music Soda by Cinematic Orchestra 

              twitter.com/davedingo
</div>

Then run this code:

$('#demo').condense({condensedLength: 400});

[mfollett]

good fix!