Cleaned up travis file and added php 5.6 testing
Cleaned up travis file and added php 5.6 testing

nikolajlovenhardt/laravel-twilio,rap2hpoutre/laravel-twilio,abueldahab/laravel-twilio,tomschlick/laravel-twilio,aloha/laravel-twilio,philnash/laravel-twilio,meditsimple/laravel-twilio