Nobody needs flexslider styles except home page.

Also remove display none for map image in contact
page in small viewport, the image still loads 
anyway and that needs to be handled through 
alternative views by mime type.
Add announcements to footer.

- Migration.
- Model with scope for pulling announcements where
todays date is between the start date and the end
date.
- Application helper method to pull first one.
- Expose in footer view.
Fix announcement formatting for small viewports.
Precompile assets.