Questionnaire management: add/delete a page
* QuestionnaireController: add functions to add and delete a page
* fixture/data.yml, we only store pageNumber as 'text', add permissions to delete/add page
* QuestionnairePageNode: we only store pageNumber and add 'Page' to it
* helper/QuestionnaireElement: adjust url to delete the page
* edit.phtml: removed links to add question at the of screen (is already on page), move link to add page to page tab
* I18n: remove commented var_dump
* questionnaire.css reduces min height of questionnaire part, nicer layout after adding a page (hackje)
* edit.js remove javascript methods to add/delete a page
pivotal story:  https://www.pivotaltracker.com/story/show/48716289