dev_banner comes to Drupal 7

I just released a Drupal 7 port of the Development Banner module. It was an illumiating experience, learning of some of the subtle changes required to go to D7. I'm liking 7 more and more, as a dig around under the hood with a source debugger. It is easier now to have a pretty complete separation between code and presentation, which has always been a kind of hold grail for web developers.

Special thanks to bocaj for his excellent suggestions and help with testing.