Can now send challenges to registered users and users can view pending challenges.
Merge branch 'master' of https://github.com/jubjubbird01/hide-and-street

# By InTheLittleWood (4) and others
# Via InTheLittleWood (2) and adeniszczyc (2)
* 'master' of https://github.com/jubjubbird01/hide-and-street:
  Fixes, do not take any images called: map-bg-opaacity-70.png map-pg-opacity-30%
  Got rid of HUGE images… … … … … ...
  Removing .DS_Store
  Temporary fix for massive distance problem
  I DUNNO! Ummm… Leaderboard!
  Added Wikipedia API with info panel
  Added basic call

Conflicts:
	app/assets/stylesheets/styles.css.scss
Random challenges from user working