Some improvements:
- Use WordPress start of the week setting to customize calendar first day (props @schwarzaufweiss)
- Add 2 filters so that themes can override the modal and global css (props @schwarzaufweiss)
- Allow non logged in user to access public rendez-vous (props @pollyplummer)
- Use Display Names in user rendez-vous preferences
- remove "n" query args before redirecting once the user set his preferences

git-svn-id: https://plugins.svn.wordpress.org/rendez-vous/trunk@890844 b8457f37-d9ea-0310-8a92-e5e31aec5664