Clean slate

.rubocop.yml

@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.1
+  TargetRubyVersion: 2.3
   Exclude:
     - !ruby/regexp /(vendor|bundle|bin|db|tmp)\/.*/
   DisplayCopNames: true
@@ -12,11 +12,6 @@ AllCops:
 Rails:
   Enabled: true
 
-Lint/NestedMethodDefinition:
-  Enabled: false
-  Exclude:
-    - test/action_controller/serialization_test.rb
-
 Style/Alias:
   EnforcedStyle: prefer_alias
 
@@ -24,24 +19,24 @@ Style/StringLiterals:
   EnforcedStyle: single_quotes
 
 Metrics/AbcSize:
-  Max: 35 # TODO: Lower to 15
+  Max: 15
 
 Metrics/ClassLength:
-  Max: 261 # TODO: Lower to 100
+  Max: 100
   Exclude:
     - test/**/*.rb
 
 Metrics/CyclomaticComplexity:
-  Max: 7 # TODO: Lower to 6
+  Max: 6
 
 Metrics/LineLength:
-  Max: 251 # TODO: Lower to 80
+  Max: 100
 
 Metrics/MethodLength:
-  Max: 106 # TODO: Lower to 10
+  Max: 10
 
 Metrics/PerceivedComplexity:
-  Max: 9 # TODO: Lower to 7
+  Max: 7
 
 Style/AlignParameters:
   EnforcedStyle: with_fixed_indentation
@@ -49,9 +44,6 @@ Style/AlignParameters:
 Style/ClassAndModuleChildren:
   EnforcedStyle: nested
 
-Style/Documentation:
-  Enabled: false
-
 Style/MissingElse:
   Enabled: true
   EnforcedStyle: case
@@ -72,34 +64,5 @@ Style/SignalException:
 Style/TrailingCommaInLiteral:
   EnforcedStyleForMultiline: no_comma
 
-Style/ConditionalAssignment:
-  Enabled: false
-
 Style/DotPosition:
   EnforcedStyle: leading
-
-########## test_helper.rb sanity
-Style/EndBlock:
-  Exclude:
-    - test/test_helper.rb
-
-Style/SpecialGlobalVars:
-  Exclude:
-    - test/test_helper.rb
-
-Style/GlobalVars:
-  Exclude:
-    - test/test_helper.rb
-
-Style/AndOr:
-  Exclude:
-    - test/test_helper.rb
-    - 'lib/active_model/serializer/lint.rb'
-
-Style/Not:
-  Exclude:
-    - test/test_helper.rb
-
-Style/ClassCheck:
-  Exclude:
-    - test/test_helper.rb