Added basic Travis CI config
Added basic Travis CI config .. blub
Added tests and PHPUnit (composer). Fixed bugs.

Fixed a few issues in types (Boolean, TimeOfDay).
Added PHPUnit as a dev dependency in composer.json
composer.lock is now also versioned.
Added `composer install` command to Travis CI config
Merge pull request #5 from itavero/dev-tests

Basic unit tests. Fixes #3