Merge pull request #25 from cloud66/master

Private email is not returned if the public one is blank

Author: mbleigh

lib/omniauth/strategies/github.rb

@@ -48,7 +48,7 @@ def raw_info
       end
 
       def email
-        raw_info['email'] || primary_email
+         (raw_info['email'].nil? || raw_info['email'].empty?) ? primary_email : raw_info['email']
       end
 
       def primary_email