Add module description to .info file

If you download and try to enable the entity print module, you will see that the Off/On button on the module administration page is greyed out. It is not possible to enable the module. If you look at the module's .info file you see that it lists PHPWKHTMLTOPDF as a dependency. It would be nice for this to be clearly listed on the module administration page. I have submited a patch that adds a description to the .info file (used copy from the module page). Once a description is added, the dependencies show up as well so it will be more clear why the Off/On button is greyed out when you first want to enable the module.