Internal renaming of elder,leader,regular,basic to numbers

Changed internals so trust levels are referred to with

TrustLevel[1], TrustLevel[2] etc.

This gives us much better flexibility naming trust levels, these names
are meant to be controlled by various communities.

app/serializers/admin_detailed_user_serializer.rb

@@ -22,7 +22,7 @@ class AdminDetailedUserSerializer < AdminUserSerializer
   has_one :approved_by, serializer: BasicUserSerializer, embed: :objects
   has_one :api_key, serializer: ApiKeySerializer, embed: :objects
   has_one :suspended_by, serializer: BasicUserSerializer, embed: :objects
-  has_one :leader_requirements, serializer: LeaderRequirementsSerializer, embed: :objects
+  has_one :leader_requirements, serializer: TrustLevel3RequirementsSerializer, embed: :objects
   has_many :groups, embed: :object, serializer: BasicGroupSerializer
 
   def can_revoke_admin
@@ -70,7 +70,7 @@ class AdminDetailedUserSerializer < AdminUserSerializer
   end
 
   def include_leader_requirements?
-    object.has_trust_level?(:regular)
+    object.has_trust_level?(TrustLevel[2])
   end
 
 end

app/serializers/trust_level3_requirements_serializer.rb

@@ -1,4 +1,4 @@
-class LeaderRequirementsSerializer < ApplicationSerializer
+class TrustLevel3RequirementsSerializer < ApplicationSerializer
   attributes :time_period,
              :requirements_met,
              :days_visited, :min_days_visited,
@@ -13,7 +13,7 @@ class LeaderRequirementsSerializer < ApplicationSerializer
              :num_likes_received, :min_likes_received
 
   def time_period
-    LeaderRequirements::TIME_PERIOD
+    TrustLevel3Requirements::TIME_PERIOD
   end
 
   def requirements_met