Updated apipie; removed api link extensions; removed duplicate gems from Gemfile
Merge pull request #7 from openstax/apipie

Updated apipie; removed api link extensions
User_groups now own doorkeeper apps (accessible from group's show page)
Added API stuff through the new gem and AccessPolicy through OSU
fixed errors with empty variable name input, no longer sending null logics from BB
Merge pull request #8 from jpslav/fixes

fixed errors with empty variable name input, no longer sending null logics from BB
Namespaced dev under admin, so the console is now shared