Add verifyPlugin task to travis build to avoid invalid plugin.xml
Add verifyPlugin task to travis build to avoid invalid plugin.xml

Haehnchen/idea-php-symfony2-plugin,Haehnchen/idea-php-symfony2-plugin,Haehnchen/idea-php-symfony2-plugin,Haehnchen/idea-php-symfony2-plugin,Haehnchen/idea-php-symfony2-plugin,Haehnchen/idea-php-symfony2-plugin