Add base WP migrations for unit testing only

 * Create table if not exists ...
 * Default WP table engine to InnoDB
Avoid deprecated function in formula
Improve CI environment

* Remove unneeded phantomjs from npms
* Avoid environment create from CI test
Init simple travis with composer update under PHP 5.2

* PHP 5.2: Install composer under under 5.3, use php-cgi
* Fix nginx setup to IP
* Activate integration tests
Delete plugin only in last step