Move back to HDBC#1

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viviag wants to merge 5 commits intomasterfrom

Commits on Sep 5, 2018

Add TODO
Vit Guzeev
committed
Store migrations with .yml extension
Vit Guzeev
committed
Do not depend on contravariant
Vit Guzeev
committed
Convert to Stack project and freeze version of hasql
Vitalii Guzeev
committed

Commits on Sep 8, 2018

Fix test suite
Vitalii Guzeev
committed