fixed issue with not overriding of existing value of map#8

Merged

darccio merged 2 commits intodarccio:masterfrom dutchcoders:master

Apr 6, 2015

+89-17

Commits on Jan 29, 2015

fixed issue with not overriding of existing value of map, and added expect test
nl5887
committed

Commits on Feb 2, 2015

added MergeWithOverwrite and MapWithOverwrite
nl5887
committed