Rearrange `repr`#140

Merged

dimitri-yatsenko merged 4 commits intodatajoint:masterfrom

eywalker:master

Jul 29, 2015

Commits on Jul 28, 2015

Move query preview to Fetch object and implement summary __repr__ for RelationalOperand
Edgar Y. Walker
committed
Add len to Fetch and add test case for Fetch repr
Edgar Y. Walker
committed
Relation repr now returns full class name
Edgar Y. Walker
committed
Add repr for FreeRelation
Edgar Y. Walker
committed