Ported testing to BaseTestNext

[rprechelt]

I ported all of the testing over to BaseTestNext; they pass reliably on my local machine (we will have to see what Travis says).

Travis Results:

• v0.4: Build completes and all tests pass
• nightly: Still failing @replaceBase.sin test.

[simonbyrne]

I think we can safely deprecate 0.3 support. I'll tag a last version now, and then you can bump the require file, and remove the line from .travis.yml.

[rprechelt]

Ok; I've updated .travis.yml and the require file to drop support for v0.3 All of the tests still pass on v0.4, but replaceBase sin test still fails on Travis, but not on any of my local machines. I'm at a loss for why this is occurring; if you have any suggestions, I can look into them before we merge.

[simonbyrne]

This is the same test that was causing the problem in #6. I'll merge it for now, as it still passes on 0.4, and we can figure this out later.

Thanks!

[rprechelt]

@tkelman I'll make the change in my other open PR.