Fixing my Author name to Ankit Gupta

http://contributors.rubyonrails.org/contributors/ankit-gupta-fir/commits
http://contributors.rubyonrails.org/contributors/ankit8898/commits
Merging the above two authors.  As it's me
Merge pull request #20 from ankit8898/master

Fixing my Author name to Ankit Gupta