Original MultipleInputs and dependencies.
Patched MultipleInputs to support globs and update SnapshotJob to batch partitions.
Added notes dicussing MultipleInputs patch.
Added extra spec, to test glob resolution on disk.
Fix typos.
Merge pull request #459 from ambiata/topic/multi

Patched MultipleInputs to support globs and update SnapshotJob to batch partitions.
Use index to guarantee uniqueness for virtual features