SafeSequence tests
Dropped SafeSequence and OrdNonNull
Remove the MonoFoldable1 typeclass
Remove Sequence constraint on NonNull.

This was done to allow NonNull to be used for such things as Set and
Map.
Add a FIXME for the future
documentation fixes
Rename partialFoo to fooEx

Pinging @gregwebs
MonoFoldableOrd
Move headEx and lastEx into MonoFoldable
Merge remote-tracking branch 'origin/ver0.3' into ver0.3
Minor spacing change
Merge pull request #21 from snoyberg/ver0.3

Ver0.3