GROOVY-5863: ImportCustomizer for CompilerCustomizationBuilder is not added to configscript CompilerConfiguration
GROOVY-5872: Null values cannot be assigned to fields which type use a generic type
GROOVY-5812 fix type conversion bug for direct method calls
Merge pull request #91 from andresteingress/missing_customizer

GROOVY-5863: ImportCustomizer for CompilerCustomizationBuilder is not ad...
merged
Merge branch 'master' of https://github.com/groovy/groovy-core