Changed Timeline controller #index to return only specified users'
timelines
Changed session#create action
Another refactoring in the Session Controller
Fixed how bin/ folder should be handled
Updated the ruby and rails versions
Added spring as a spork replacement and removed a lot of now useless
gems
Removed some stuff related to frontend and fixed routing
Removed the public directory so that we can add it later as a submodule
Added kelasi-public repo as a submodule
Some simple improvements to rspec formatting
Added rake tasks for managing public submodule
Added medium model

Used a polymorphic association to connect different kind of media
(e.g. Audio, Video, Image, Document) to medium model
Record necessary VCR cassettes
Added MediumUploader and initially configured it