Updating Dropbox dropins integration: changing button positions and dynamic upload link generation.

git-svn-id: http://umple.googlecode.com/svn/trunk@3215 6ebf9d09-8eb1-0036-9d08-68c07d1b990a
patch-TIANYUANCHU-UmpleImport-class-attributes-and-dataTypes

git-svn-id: http://umple.googlecode.com/svn/trunk@3216 6ebf9d09-8eb1-0036-9d08-68c07d1b990a