Issues with Travis testing

[marcochiesi]

Travis was triggering an error about PHP 5.3 not being supported, so I updated the minimum PHP version to 5.6 on .travis.yml (see commit 4db7976), but unfortunately testing still fails for a different issue:

+mysqladmin create wordpress_test --user=root --password= --host=localhost --protocol=tcp
mysqladmin: [Warning] Using a password on the command line interface can be insecure.
�mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to MySQL server on 'localhost' (111)'
Check that mysqld is running on localhost and that the port is 3306.
You can check this by doing 'telnet localhost 3306'
The command "bash bin/install-wp-tests.sh wordpress_test root '' localhost $WP_VERSION" failed and exited with 1 during .

@tlovett1 I would appreciate it, if you could have a look. Thank you!