Refactoring of Delta.IDs & horizon functionality with a PrimaryKey type, needed for implementing UUID based primary keys for backends such as the appengine datastore \n Tests: at top level and if available per backend, if not then just visual
Fix leveldb change skew

Make leveldb match the changes in syndtr/leveldb API due to breakages at
syndtr/goleveldb@63c9e64.
Merge pull request #188 from kortschak/leveldb

Fix leveldb change skew
temporary travis fix
Merge pull request #189 from barakmich/testdeps

temporary travis fix
mathutil is back in line
Merge pull request #190 from barakmich/testdeps

mathutil is back in line
Merge pull request #186 from panamafrancis/primarykeys

Implementation of the PrimaryKey type