Fix up travis.
Improvements to the tests.
Merge pull request #64 from apenney/tests

Improvements to the tests.
Release 0.3, in preparation for major refactoring.

This is the final development release in preparation for a major
refactoring of the puppetlabs-mongodb module.
Merge pull request #65 from hogepodge/release_0.3

Release 0.3, in preparation for major refactoring.