Docx export from search result

Hi,

This is a small export from search results, allowing to create docx files. The treatment is done through phpword, which is included in this pull request (same idea than the one with XLSX : most of users have OpenOffice here but not all ; everyone can open docx files).
Next step would be to make it fully customizable, same way than printTemplates, maybe inside a wordProcessingTemplates dir. For now, I just want to know if you're ok with that pull request.

If not ok, this functionality could also be an inpendent plugin, all I would need is to add a hook inside BaseFindController.php, why not.

Side note : it's much faster to produce a docx file than a checklist pdf when having hundreds of results, and has a lesser memory footprint.