:email: Update email addresses for Chad and myself.
Use shields.io for the badge.
Add badges for packagist.
Specify the testsuite in the phpunit.xml.

This is done so that it doesn't have to be specified on the phpunit
command line.
Enable strict code coverage.
Remove --dev from composer install.

composer install installs dev dependencies by default.
Merge pull request #7 from nubs/minor-changes

Some minor developer changes.