Adds Ecto Adapter

[warmwaffles]

No description provided.

[warmwaffles]

I've been pouring over https://github.com/elixir-ecto/ecto_sql and https://github.com/elixir-ecto/ecto to figure out what callbacks need to be implemented.

I think the closes implementation we should probably look to would be the MySQL implementation. Rationale for that, myxql has to deal with similar issues sqlite has where we are missing the returning ability for insertion.

I don't think it is so important to support that feature.

[warmwaffles]

I think the worst part about the current set of adapters that exist within ecto_sql is that they are really hard to test. There are a bunch of private utility methods that are buried deep within the code and make it difficult to test and verify things.

I'm going to come up with something a little more manageable soon.