Mimics Hoe's test loading mechanism
Mimics Hoe's test loading mechanism

- Use Minitest's autorun
- Require all test files
- Accept extra environment options (`FILTER`, `TESTOPTS` and `N`)
  to alter which test will be run or the seed to be used
- Disable RubyGems by default and require it instead.
- Enable Ruby warnings to help out deal with deprecations/possible
  issues.

luislavena/gem-compiler