Text Outlining Improvement

The current method for outlining an image is slightly broken. It's possible that a pixel in a completely transparent area needs to be made into an outline, but textimage misses them and doesn't create the outline there. This usually happens with letters like a lower case 'm', 'o', or other characters with tight inner spaces. It only occurs at small font sizes (14-24 about).

One line patch which corrects this problem.