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
Add build status image into readme
Delete plugin only in last step
Adding many WP versions and one custom MyISAM build
Adding all planned WP and PHP versions to finalize matrix
Update mocha start script for local environment
Patch WP 3.3 to fix fatal under PHP 5.4 and upwards
Merge branch 'issue/setup-ci-on-travis' into develop