Implement track requests and add the track organizer role

About track requests:
Create migration that adds the fields submitter_id, state, and
cfp_active to Tracks
Add validations and the self_organized? method to the Track model
Create a new TracksController outide of the admin namespace
Create the relevant views for index, show, new and edit
Modify the admin views for tracks to include extra info for
self-organized tracks

About track organizers:
Create the role when a self-organized track is created
Define track organizer abilities
Modify the roles views and controller to handle the new role

The route for Roles#edit needs to have higher priority than the nested
routes for track roles, otherwise, the word edit in the url is matched
as a track with short_name edit

app/models/track.rb

@@ -1,6 +1,10 @@
 class Track < ActiveRecord::Base
   include RevisionCount
+
+  resourcify :roles, dependent: :delete_all
+
   belongs_to :program
+  belongs_to :submitter, class_name: 'User'
   has_many :events, dependent: :nullify
 
   has_paper_trail only: [:name, :description, :color], meta: { conference_id: :conference_id }
@@ -14,13 +18,27 @@ class Track < ActiveRecord::Base
             uniqueness: {
               scope: :program
             }
+  validates :state, presence: true, if: :self_organized?
+  validates :cfp_active, inclusion: { in: [true, false] }, if: :self_organized?
 
   before_validation :capitalize_color
 
+  after_create :create_organizer_role, if: :self_organized?
+
   def conference
     program.conference
   end
 
+  ##
+  # Checks if the track is self-organized
+  # ====Returns
+  # * +true+ -> If the track has a submitter
+  # * +false+ -> if the track doesn't have a submitter
+  def self_organized?
+    return true if submitter
+    false
+  end
+
   private
 
   def generate_guid
@@ -38,4 +56,10 @@ class Track < ActiveRecord::Base
   def conference_id
     program.conference_id
   end
+
+  ##
+  # Creates the role of the track organizer
+  def create_organizer_role
+    Role.where(name: 'track_organizer', resource: self).first_or_create(description: 'For the organizers of the Track')
+  end
 end