Add basic integration benchmarks

Currently only memstore is benchmarked and only with gremlin. No
checking of validity of results is performed.
Fix typos
Add result validation
Merge branch 'master' into benchmarks
Update tests to use cquads parsed data
Allow short tests
Move query interface definitions into query
Move sexp into query
Only run short tests on travis

Long tests are potentially very long, and may timeout internally. So
don't run them.
Merge pull request #88 from kortschak/benchmarks

Add basic integration benchmarks