Merge pull request #108 from coolbung/feature-appstore-client

Feature appstore client
Removed a blank line leftover
Removed proxy from php code and removed global define for apps base url
Merge pull request #121 from beat/feature-appstore-client

Feature appstore client: Removed client-local code, proxy, and going JSONP (includes latest from Ashwin)
Merge branch 'feature-appstore-client' of github.com:joomla-projects/joomla-cms into feature-appstore-client
Removed constant, using JVERSION for the version now