Fix broken SnapshotMetaSpec
Change Date arbitrary so it doesn't skip
SnapshotMeta.latest should take latest based of date/store pair, not just date
Take the greatest snapshot id when there are duplicate snapshots

- Added more test cases
- Added OldIdentifier arbitrary
Merge pull request #140 from ambiata/topic/fix-broken-smapshot-meta-test

Fix broken SnapshotMetaSpec
Use the IVORY_NO_CODEC env variable
cat facts can now read both snapshots and facts
added recreate regression tests for factsets
Merge pull request #146 from ambiata/topic/recreate-regression-test

recreate regression test
Added Dataset data structures

- Added Prioritized[A] to hold anything which is prioritized
Added Functor to Prioritized
Merge pull request #148 from ambiata/topic/generalize-plan-datasets

Dataset data structures
Upgrade to Scala 2.11.2

http://www.scala-lang.org/news/2.11.2
Update version of Scala Travis is using
Disable the use of macro paradise for 2.11.x as no longer needed