Re-add tests for those who use the `npat` option.

Some users have npm run tests automatically after installing. This
PR removes the tests from .npmignore, thus allow them to install
and test happily.

Fixes #106

If accepted, make sure to republish!  Thanks!
Merge pull request #107 from droppedonjapan/master

Re-add tests for those who use the `npat` option.