Force covers annotations.
Ignore tests for the scrutinizer build analyzers.
Use the shields.io flat svg badges.
Only execute phpunit on travis.

Everything else executes on scrutinizer and hhvm has issues with the
build.php.
Use phpunit as a library.
Use phpcs as a library.
Remove --dev from composer install.

--dev is the default.
Merge pull request #3 from nubs/master

Update build scripts to use phpunit/phpcs as a library.