Initial commit of basic PhoneGap OIDC Implicit Client

 * Requires custom patch of the inappbrowser plugin
  ( https://github.com/ciaranj/cordova-plugin-inappbrowser/commit/b2123c2c0902d83d8393afb9da4e40b77f93d060 )

 * To test just change api.js to reflect the actual host of your IDSrv3 instance