Hooked up Engagement Index with API

https://jira.ets.berkeley.edu/jira/browse/CYB-82

PR crucial for today's meeting

Hooked up @richcreationsrc Engagement Index with DataCulture's API
DataCultures can query it's DB and bring relevant information to Engagement Index
The seeds.rb isn't run on every migration; in fact, it isn't a migration (it is not in the db/migrations/ folder, and it doesn't inherit from ActiveRecord::Migration).   Instead, it gets run by a rake task ("rake db:seed").   You could uncomment them and leave them in the seeds.rb file.  I would have to verify but I don't think that the seeds data is loaded on deployment (so as to not add bogus data into production).