add tests to demonstrate queries using alias#365

Merged

wwwjfy merged 3 commits intopython-gino:masterfrom

wwwjfy:alias-loader

Oct 23, 2018

Commits on Oct 21, 2018

add tests to demonstrate queries using alias
wwwjfy
committed

Commits on Oct 22, 2018

update to use Label to cover changed code in test
wwwjfy
committed

Commits on Oct 23, 2018

remove unused import
wwwjfy
committed