Added support for inline extensions based on asciidoctorj-groovy-dsl
code cleanup in AsciidoctorTaskInlineExtensionsSpec

- cleanup of imports
- cleanup of whitespace and indention
- removed unused statements
Merge branch 'sclassen-95_InlineExtensions' into 95_InlineExtensions
Merge pull request #129 from robertpanzer/95_InlineExtensions

Added support for inline extensions based on asciidoctorj-groovy-dsl