Add library info for Composer
Ignore Composer vendor directory
Do not version composer.lock
Binaries installed via composer now live in bin directory
Should not version composer binary with project files
Use Composer's autoloader
Use phpunit binary to execute test suite

runtests script no longer needed. New way to run tests:

cd into project directory
Execute 'phpunit'
Merge pull request #3 from johnkary/composer

[PR3] Better support for Composer
Slight restructure
More cleanup
Make it prettier