Added registration segment to display description, period

Controller test for Conference#show

houndci fixes

Rebased with single entry for navigation branding

Conditional rendering of splash navbar
Add tickets to registration segment
Fixed view specs, passing
updated db/schema.rb
Merge pull request #177 from gopesht/add_tickets_to_registration_segment

Add tickets to registration segment
Call for papers component for splash page
Rebased and changes in countdown timer logic