GROOVY-6077: add meta class version test for callsite
GROOVY-6508 Make outer class property dispatchers use PropertyExpression rather than AttributeException
Fix for GROOVY-6495: Add quoting
GROOVY-6490

http://jira.codehaus.org/browse/GROOVY-6490 excessive reload of dependencies in GroovyScriptEngine. Solve storing the last-modified attribute from the source file in the scriptCache.
GROOVY-6490: avoid a lastmodified time in the future, force removal of up-to-date dependencies
GROOVY-6521: GStringTemplate engine is sharing the binding