Implement role authorization

app/views/home/_conference_details.html.haml

@@ -31,9 +31,9 @@
                 = link_to "View Conference", conference_path(conference.short_title), :class =>"btn btn-default"
             - if conference.registration_open?
               - if conference.user_registered?(current_user)
-                = link_to "Modify Registration", register_conference_path(conference.short_title), :class =>"btn btn-default"
+                = link_to "Modify Registration", conference_register_path(conference.short_title), :class =>"btn btn-default"
               - else
-                = link_to "Register", register_conference_path(conference.short_title), :class =>"btn btn-success"
+                = link_to "Register", conference_register_path(conference.short_title), :class =>"btn btn-success"
             = link_to "Schedule", conference_schedule_path(conference.short_title), :class =>"btn btn-default" if conference.call_for_papers and conference.call_for_papers.schedule_public
             - if !current_user.nil? && current_user.proposal_count(conference) > 0
               = link_to "View My Proposals", conference_proposal_index_path(conference.short_title), :class =>"btn btn-default"

app/views/home/index.html.haml

@@ -2,4 +2,4 @@
   .col-md-12.page-header
     %h2.text-center Upcoming Conferences
 - @current.each do |conference|
-  = render :partial => "conference_details", :locals => {:conference => conference}
+  = render :partial => "conference_details", :locals => {:conference => conference}