Arb instances#3

Merged

paf31 merged 2 commits intopurescript:masterfrom

jdegoes:arb-instances

Oct 1, 2014

Commits on Oct 1, 2014

added arb instances, a couple tests, and a few more utility functions
jdegoes
committed
Merge branch 'master' of github.com:purescript-contrib/purescript-lists into arb-instances
jdegoes
committed