Upgrade testing infrastructure to haskell-ci

[RyanGlScott]

This leverages haskell-ci to make the testing infrastructure for hoopl more robust. Among the benefits are that it uses cabal new-build (so it doesn't rebuild dependencies quite as often) and that it checks if all files that need to be bundled with the sdist actually are bundled (avoiding issues like #47 going forward).

Fixes #46 (since it updates the upper version bounds on base in the test suite) and fixes #47 (since it properly bundles test files with the sdist).

[RyanGlScott]

Ack, I screwed this up. Closing in favor of #49.