Modify hello.js

- Remove the default oauth_proxy value
- Change the localStorage key
Fix jshint and add test reading's ping testing spec
1.8.0
Merge branch 'release/1.8.0' into develop
Merge pull request #35 from eCrowdMedia/release/1.8.0

Release/1.8.0
Merge branch 'master' of github.com:eCrowdMedia/OAuthAPI into develop