Unsafe head/last/tail/init
Added a bunch of Container functions
Merge commit 'be5158eb7b1f5cbc736f50867f62efe4a2455fc4'
Fix cabal file
unsafe take/drop/splitAt
Fixes for GHC 7.4
Polymorphic difference and intersection snoyberg/classy-prelude#48
Merge branch 'master' into minlen

Conflicts:
	src/Data/Containers.hs
	src/Data/Sequences.hs
	test/Spec.hs