Editing a page that has an embeded document doesn't work properly #79 (#80)

* The initial structure was generating invalid HTML, and because of this, WYSIWYG was moving nodes around. To solve this, I need to add the block wrapper myself.

Author: Farcasut

src/main/resources/GoogleApps/DriveMacro.xml

@@ -458,7 +458,7 @@ if(!gagroovy.useDrive) {
      if (editLink && editLink.startsWith("http"))
        print """ - [[Edit>>url:${editLink}]]"""
      println ")))"
-     println """{{html clean=false}}<iframe src="${embedLink}" width="${width}" height="${height}"></iframe>{{/html}}"""
+     println """{{html clean=false}}<div><iframe src="${embedLink}" width="${width}" height="${height}"></iframe></div>{{/html}}"""
     } else {
       def tquery = ""
       if (query)