Implement clojurewerkz.titanium.core/open for configuration objects
Implement clojurewerkz.titanium.core/open for Clojure maps
Generalize to all maps
More descriptive argument names
Rename querying macros
Initial integration tests
More integration tests
Gremlin pipeline improvements
Titan-specific element predicates
Add back and dedup GremlinPipeline operations
Initial tables support in gpipe

Currently not entirely user-friendly because Pipes does not
expose column name information so we cannot produce immutable
maps for rows.