Added three tests for Cord
Fixed a bug in Cord (split was duplicating the tail)
Merge pull request #272 from vpatryshev/scalaz-seven

Added three tests for Cord, fixed a small bug
law checking for Cords
Move replicateM, replicateM_, filterM and partitionM to Applicative.
compare new `filterM` and `replicateM` with old implementation
Merge pull request #265