Sketch sparse ProductValue implementation (tests fail)
Bugfixes to ProductValue code (tests still fail)
Merge branch 'master' into sparse-value
Add sparsity type NONE (still broken)
Add NONE target to ValueSchema::normalize_small
Fix bugs in ProductValue operations (still broken)
Use observed.dense in query server (still broken)
Ignore trivial features in query tests
Refactor ProductSchema to use Observed directly
Use model instead of init in test_runner.test_generate
Only test datasets with probably at least one observation per column
Fix bug in test_query.get_example_requests
Make unit tests cheaper to run
Add more expensive big-test and bigger-test make targets
Merge pull request #25 from priorknowledge/sparse-value

Implement sparse ProductValue