add convenience methods for creating new maps, sets, and counters#4

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hopkinsth wants to merge 3 commits intoriaken:masterfrom hopkinsth:feature/convenience-methods

+41

Commits on Nov 23, 2014

add convenience methods for creating new maps, sets, and counters inside another map
Thomas Hopkins
committed

Commits on Nov 26, 2014

update docs
Thomas Hopkins
committed
add test for map convenience methods
Thomas Hopkins
committed