Merge pull request #23 from snoyberg/master

GHC 7.8 support
Relax array dependency for GHC 7.8.1
Merge pull request #25 from maoe/ghc-7.8.1

Relax array dependency for GHC 7.8.1
Release version 0.5.9, GHC 7.8 compatibility
Remove utf8-light dep