Add tests and make them pass on v0.4 - v0.6

[jgoldfar]

No description provided.

[jgoldfar]

Oops... May replace #15, #12, #11

[jgoldfar]

This does pass CI BTW: https://travis-ci.org/jgoldfar/DBI.jl/builds/253428805 and will be required to get PostgreSQL passing: https://travis-ci.org/jgoldfar/PostgreSQL.jl in particular https://travis-ci.org/jgoldfar/PostgreSQL.jl/jobs/253423098

[iamed2]

I would 1) drop 0.4 and 2) put more specific version bounds on DataFrames and DataArrays (I'm suspicious that many versions will fail here).

[jgoldfar]

I'm not sure how to test specific version compatibility of the package with others. Is there a standard way to do it other than pinning a version locally and checking that the package loads?

[iamed2]

It's either that or look through the code

[jgoldfar]

Just updated this branch removing v0.4 support as well as the dependence on DataFrames and DataArrays, which were not explicitly used anywhere. Maybe they were meant to be? Travis (https://travis-ci.org/jgoldfar/DBI.jl/builds/258300798) reports all good without them...

[jgoldfar]

Thanks to @amgad-naiem for helping remove the remaining depwarns on v0.6 and schooling me a bit on git/github. Anything remaining to do here?