Fixes Style/Tab cops

Removes exclusions for Style/Tab cops in rubocop_todo
Places Style/Tab cop in appropriate alphabetical order
All cops now fixed.

.rubocop.yml

@@ -88,6 +88,10 @@ Style/SpaceAroundOperators:
 Style/StringLiterals:
   Enabled: true
 
+# This cop checks for tabs where spaces should be used.
+Style/Tab:
+  Enabled: true
+
 # Avoid trailing blank lines
 Style/TrailingBlankLines:
   Enabled: true

.rubocop_todo.yml

@@ -609,17 +609,6 @@ Style/SymbolProc:
     - 'spec/controllers/admin/conferences_controller_spec.rb'
     - 'spec/support/flash.rb'
 
-# Offense count: 23
-# Cop supports --auto-correct.
-Style/Tab:
-  Exclude:
-    - 'db/migrate/20141031225545_add_require_handicapped_access_to_questions.rb'
-    - 'db/migrate/20141031225606_add_attending_with_partner_to_questions.rb'
-    - 'db/migrate/20141031225620_add_staying_at_suggested_hotel_to_questions.rb'
-    - 'db/migrate/20141031225635_add_attending_social_events_to_questions.rb'
-    - 'db/migrate/20141118162030_change_lodging_association_to_conference.rb'
-    - 'spec/features/campaign_spec.rb'
-    - 'spec/features/event_types_spec.rb'
 
 # Offense count: 26
 # Cop supports --auto-correct.