Update travis.

Signed-off-by: crynobone <crynobone@gmail.com>
Use short array syntax since there no plan for PHP 5.3 support.

Signed-off-by: crynobone <crynobone@gmail.com>
Merge branch '2.2'
Use illuminate/contracts.

Signed-off-by: crynobone <crynobone@gmail.com>