Adding Amy Brown
Merge pull request #470 from gvwilson/adding-amy-brown

Adding Amy Brown
Renaming the 'sponsors' directory to be 'credits' to be consistent with 'img/credits'
Merge pull request #471 from gvwilson/renaming-sponsors-to-credits

Renaming the 'sponsors' directory to be 'credits' to be consistent with 'img/credits'
Merge branch 'master' of git://github.com/swcarpentry/website