Commit of README  update for BBC-Wraith pull request
Added an extra Imagemagick command to overlay a watermark onto any excess whitespace Wraith generates
Merge pull request #171 from andrewccadman/selenium-wraith-readme

Commit of README  update for BBC-Wraith pull request
Revert "Added an extra Imagemagick command to overlay a watermark onto any excess whitespace Wraith generates"

This reverts commit f1c596b31b1e0d7fe3f5efbd258e67bb07b4b34b.