Add php 7 testing on travis
Add php 7 testing on travis

gaetan-be/phpxmlrpc,howaichun/phpxmlrpc,howaichun/phpxmlrpc,dreibh/planetlab-lxc-plcapi,gaetan-be/phpxmlrpc,howaichun/phpxmlrpc,howaichun/phpxmlrpc,gaetan-be/phpxmlrpc,dreibh/planetlab-lxc-plcapi,gaetan-be/phpxmlrpc,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi