splash page additions

Changes:

- added to a file
routes/routes.js

- added a folder
public/assets/img/splash/

- added files
views/includes/foot-splash.jade
views/includes/navbar-splash.jade
views/splash.jade

- added images
public/assets/img/splash/coverphoto.jpg
public/assets/img/splash/facebook-hover.png
public/assets/img/splash/facebook.png
public/assets/img/splash/instagram-hover.png
public/assets/img/splash/instagram.png
public/assets/img/splash/new-logo.png
public/assets/img/splash/twitter-hover.png
public/assets/img/splash/twitter.png