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Downcase email before hashing

According to the Gravatar docs, all emails should be converted to all
lowercase before hashing.

See: http://en.gravatar.com/site/implement/hash/
Merge pull request #25 from 5thWall/patch-1

Downcase email before hashing for gravatar
Merge branch 'virtser-patch-1'

Conflicts:
	source/_includes/header.html
Merge branch 'master' into custom