GROOVY-6945: Some DGM Collection improvements
GROOVY-6940: Subscript operator causes VerifyError in markup templates
Added documention for core programming structure. Added test cases as well
Remove the conflict indicators
Moving all codes from ascidoc to Groovy scripts. Modified the test cases, all green
Merge pull request #484 from antoaravinth/doc-patch-2

Added documention for core programming structure. Added test cases as we...
Merge pull request #483 from paulk-asert/groovy6945

GROOVY-6945: Some DGM Collection improvements