GROOVY-6057: Added DGM#combinations(Collection,Closure)
GROOVY-6057: Added eachCombination and permutations(Collection,Closure)
GROOVY-6057: Add Iterable variants for combinations
Merge pull request #146 from melix/GROOVY-6057

GROOVY-6057: Added DGM#combinations(Collection,Closure)
GROOVY-6057: Fix merge with master glitch (duplicate methods)