Fix the obvious copy bug
Canonicalize leveldb internal iterator
Convert to Prefix/String in graph.Triple
Enumerate iterator types
Add documentation around Type registration
Fix missed test messages
Clean tests

Remove goconvey dependency and improve clarity of intention.
Remove dependency on goconvey
Remove goconvey dependency
convert to prefix byte
Merge pull request #48 from kortschak/enumerate

Enumerate iterator types
Update test in light of graph iterator types
Merge pull request #51 from barakmich/prefix_string

Prefix vs String for graph.Direction
dbIt to iter
merge rename_fix