Update Copyright statement

[mark-dce]

** STORY **
In order to generalize the application, we should not put specific branding in the footer (and instead provide instructions in the branding guide).

DETAILS
Current footer:

A service of Project Hydra.
Copyright © 2012 Project Hydra

CHANGE TO

This software has been developed by and is brought to you by the Hydra community. 
Learn more at the Project Hydra website
[small Powered by Hydra Logo here]

center this text in a small font at the bottom of the view. See Hydra Gem on github for partial example

NOTES
app/views/_footer.html.erb: <p><strong>Copyright &copy; 2012 Project Hydra</strong></p>

ACCEPTANCE

1. Text is changed