Update deps to work with recent ghc installs

At the limit, ghc 7.6.2 includes containers 0.5.0.0 and bytestring 0.10.0.2, both of which are excluded by the trunk dependencies of forml.

This branch generally relaxes dependency constraints to match recent versions of the referenced packages.  I did not build it as an alternative dependency set, as I'm not sure what the plans with regard to catching up with ghc 7.6 are.