Rewrote fallback mechanism in examples

Usually I can either see the image or its @alt. The examples assumed that if line 1 doesn't apply, then line 2; if line 2 doesn't apply, then line 3, etc. Thus the examples said somehow: if you don't display images using the img tab, then fall back to next line and display the paragraph. This is not the proper way things work, I think. Hoping I'm not too much intruding here, but I felt like helping on this issue. Please feel free to get in touch if I'm missing the point entirely.
Deleted img tag, replaced by p with markup
Merge pull request #23 from notabene/gh-pages

Rewrote img-to-p fallback in the examples.