Fixed issue with GWT compilation and HTML editor

Updated gwt-dnd jar file

Fixed issue with setting ID for HTML editor

Incrementing App Engine version
Merge pull request #2 from Rise-Vision/hotfix/deployment-issues

Fixed issue with GWT compilation and HTML editor
Moving class to iframe namespace
Created abstract IFrame component widget

IFrame panel functionality:
- create iframe
- add HTML to the iframe
- show/hide the iframe
- change the URL of the iframe

IFrame controller
- receives messages from iframes
- each iframe registers, by name
- iframes unregister when removed
- iframe receives a command and value pair
modified DialogBoxWidget to use IFramePanel
updated references to DialogBoxWidget
Separate RPC iframe implementation