fixes to the people page
Summary
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we should use a different default image for people who do not have gravatar than the big blue G
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Prof. Kinga isn't a developer, and should be filtered out of the list of people who are developers
Helpful Links
Gravatar explanation: http://en.gravatar.com/site/implement/images/
Our implementation is in gravatar.rb
On people.html, the logic for iterating through people is only that they are not alumni.