getting facebook friends now working
added binding for fb-element's friends and the app.appElement.user.friends
added content element and toolbar
added x-splash element, not implemented yet
added challenges, basic creation and synchronisation, WIP
fixed recursion bug where the storred challenges would make the database big and slow
fixed challenges loading notification, will be shown only for new ones, changed the timestamp on the challenges objects
added seen property on the challenges
added listview in the main screen for challenges
hiding scroll of list-view
added invisible scrolling to the listview
added device build configuration with crosswalk
updated readme
updated gitignore and removed some files
changed title
Merge pull request #15 from gngeorgiev/graph-element

Basic Facebook API element, content element with listview, proper scroll..
Merge branch 'master' of https://github.com/gngeorgiev/Challenge.Me into adding-challenges-element
added make-challenge-element html structure