fixed issue #224 - toggle_bool_column for modulized or decorated models

[qdegraeve]

When models registered in activeadmin are decorated or contain a module, the class_name method in the custom_builder.rb was not working .

[mf222]

Hi @qdegraeve , thank you for notice and for fixing this error. In order to merge your PR could you please fix the conflicts doing a rebase with master? after that we will merge your contribution.

[monkeyci]

Some files could not be reviewed due to errors:

.rubocop.yml: Style/FileName has the wrong namespace - should be Naming

.rubocop.yml: Style/FileName has the wrong namespace - should be Naming
.rubocop.yml: Style/MethodName has the wrong namespace - should be Naming
.rubocop.yml: Style/PredicateName has the wrong namespace - should be Naming
.rubocop.yml: Style/VariableName has the wrong namespace - should be Naming
.rubocop.yml: Lint/EndAlignment has the wrong namespace - should be Layout
.rubocop.yml: Lint/DefEndAlignment has the wrong namespace - should be Layout
.rubocop.yml: Style/AccessorMethodName has the wrong namespace - should be Naming
.rubocop.yml: Style/AsciiIdentifiers has the wrong namespace - should be Naming
.rubocop.yml: Style/ClassAndModuleCamelCase has the wrong namespace - should be Naming
.rubocop.yml: Style/ConstantName has the wrong namespace - should be Naming
.rubocop.yml: Style/FlipFlop has the wrong namespace - should be Lint
.rubocop.yml: Lint/BlockAlignment has the wrong namespace - should be Layout
.rubocop.yml: Lint/ConditionPosition has the wrong namespace - should be Layout
Error: The `Style/TrailingCommaInLiteral` cop no longer exists. Please use `Style/TrailingCommaInArrayLiteral` and/or `Style/TrailingCommaInHashLiteral` instead.
(obsolete configuration found in .rubocop.yml, please update it)
The `Lint/InvalidCharacterLiteral` cop has been removed since it was never being actually triggered.
The `Style/OpMethod` cop has been renamed and moved to `Naming/BinaryOperatorParameterName`.
obsolete parameter EnforcedStyle (for Style/Encoding) found in .rubocop.yml
Style/Encoding no longer supports styles. The "never" behavior is always assumed.
obsolete parameter SupportedStyles (for Style/Encoding) found in .rubocop.yml
obsolete parameter MaxLineLength (for Style/IfUnlessModifier) found in .rubocop.yml
`Style/IfUnlessModifier: MaxLineLength` has been removed. Use `Metrics/LineLength: Max` instead
obsolete parameter MaxLineLength (for Style/WhileUntilModifier) found in .rubocop.yml
`Style/WhileUntilModifier: MaxLineLength` has been removed. Use `Metrics/LineLength: Max` instead