Test only current/future PHP. and cache composer atifacts
Test only current/future PHP. and cache composer atifacts

Also testing lowest/current/highest versions of code.

* http://blog.wyrihaximus.net/2015/07/composer-cache-on-travis/
* http://blog.wyrihaximus.net/2015/06/test-lowest-current-and-highest-possible-on-travis/

alister/ReservedNamesBundle,alister/ReservedNamesBundle