Fix FunctionClauseError on Code.ensure_compiled on Ecto 1.1

[deraru]

Hello,

I found an following error.

** (FunctionClauseError) no function clause matching in Code.ensure_compiled/1    
    
    The following arguments were given to Code.ensure_compiled/1:
    
        # 1
        [MyApp.Repo]
    
    (elixir) lib/code.ex:575: Code.ensure_compiled/1
    lib/mix/ecto.ex:64: Mix.Ecto.ensure_repo/2
    lib/mix/tasks/exseed.seed.ex:23: Mix.Tasks.Exseed.Seed.run/1
    (mix) lib/mix/task.ex:301: Mix.Task.run_task/3
    (mix) lib/mix/cli.ex:75: Mix.CLI.run_task/2
    (elixir) lib/code.ex:376: Code.require_file/2

Environments:

• ecto 2.1.5
• exseed 0.0.4

I debugged this error and found a cause.
In Ecto 1.0.0, Ecto.parse_repo returns simply Repo.
Ref. https://github.com/elixir-ecto/ecto/blob/v1.0/test/mix/ecto_test.exs#L5

But after Ecto 1.1.0, Ecto.parse_repo returns [Repo].
Ref. https://github.com/elixir-ecto/ecto/blob/v1.1/test/mix/ecto_test.exs#L5

I fixed this error by using iterator.
Could you merge this?

Thanks,