Adding default compression for docx output

[topkat]

Hi,

@telemarkfylkeskommune Don't you think is a good idea to add the compression by default ? Has MS word does when saving files ?

I am the author of the pull request #209 that solve the file size problem.
Just want to know if you plan to update the module because at the moment I am using a hack of my own to get around this file size problem.

Thanks you for that great module ^^