Changed footer link 'Contributors' from text link in footer2 to graphic link in button 2, replacing Rails link.
Complete feature and spec changes for linked AV logo in footer

Specifying scenario
"And I follow the AgileVentures logo
Then I should be on the contributors page"
* app/views/layouts/_footer2.html.erb: Enlarge AgileVentures logo
Shrank AgileVentures logo PNG file
Merge pull request #8 from dcorking/footer2-has-contributors

Changed footer link 'Contributors' from text link in footer3 to graphic link in footer2, replacing Rails link