Changed like_to to link_to.
add unique index to identities on email
update the circle factory to include content and author_id
update circle spec
Merge pull request #178 from acmetech/master

add unique index to identities on email and circle updates
add validations based on migration unique index
Merge pull request #179 from acmetech/master

add validations based on migration unique index
More tests to activity_object
Correcting bad commit of gemfile.