Pretty print aggregate exprs for easier reference
Change qualified call for imported ref only
Pretty print the offending query too
Include only offending clause in error message
Terminate the worker process more gracefully
Update worker to new GenServer
Cast primary key in `Repo.get/2`

Closes #290.
Fix Repo.update docs
Fix typos Ecto.Adapter docs
Mix.Tasks.Ecto -> Mix.Ecto
update with hstore dependency
add integration tests and travis