Begin implementing a 'follow' option in the social network. Work with Nishant and Yibo.

Follow should a uni-directional relationship. You will likely have to store a list of people I follow in the User.scala model. You might also need to store a list of my followers in the model as well. Use the existing 'friends' list attribute, but the change the name to followers and followees.

On the profile page, one should be able to see a list of followers and a list of who they are following. Varun or Will can add this to the profile page.