Refactors small bits & pieces
Adds gem kaminari to Gemfile
Adds gem faker to Gemfile
Adds rake task: populate db with interviewees/videos

Seed db with 50 Interviewees that have 30 videos
Tests video/index page for correct pagination

Uses Kaminari for pagination and changed default
naming conventino of page to 'paging' to avoid possible
namnig conflict with capybara 'page'

:q