Bump version to 0.6.2.1

Also bump hastache dependency to 0.5.0

--HG--
extra : rebase_source : 3465047325f2e0dc14848298d9d11c7f8cb206b3
Added tag 0.6.2.1 for changeset 35c9e1977176
Bump version to 0.7.0.0
Allow benchmarks to be specified via globs

--HG--
rename : Criterion.hs => Criterion/Internal.hs
Enable GC between runs by default