Add coverage-html to build
Enforce @covers

Add forceCoversAnnotation to phpunit.xml
Add @covers annotations to all tests
Add colors to phpunit.xml
Use PHPUnit 4
Merge pull request #22 from chadicus/master

Some housecleaning
Fix broken link to Queue in README.
Merge pull request #23 from gaillard/master

Fix broken link to Queue in README.
Coule changes to work with newer pecl mongo extension without breaking existing.
Merge pull request #25 from gaillard/master

Couple changes to work with newer pecl mongo extension without breaking existing.
Create a docker-based build.

This helps make it easier to run this build by removing the necessity to
setup and run a local mongo server.
Merge pull request #26 from nubs/docker-build

Create a docker-based build.