added ding news category menu "plugins/content_types/news_category_menu.inc"
added hook_ctools_plugin_directory to ding_news.module
Removed old fields (was not removed), added  "Floated news list (library)" and removed Library:nid from Contextual filters in the  "Floated news list" display, fixed the panels adding "Ding news category menu" instead of  "ding category menu" and added "Floated news list (library)" and "Floated news list"  to panels.
 Use news-category/ instead of news/ for listing news belonging to a category.
Merge pull request #4 from odensecentralbibliotek/category_menu

Category menu fix