Merge pull request #122 from LI-HE/master

Update URL according to user selection
Story display update

- content alignment
- heading rename
- stats button disabled
- removed text appearing next to title input area
- content on small screen
Challenge.html update

- removed others' challenges
- on click of stats, pass in the corresponding challenge id to
challengedetails.html
Added "Create a Challenge" button to all 3 tabs
Merge pull request #37 from ChrisBoesch/master

update