consistent name and version for ie D&D plugin

Make sure the newly moved nuxeo-dragdrop-ie-extension project is able to build correctly in VS (you might need to rebuild a solution from scratch)

The build system / installer should generate a plugin with filename:

nuxeo-dragdrop-ie-extension-2.0.x.msi

Furthermore the same version number ( 2.0.x ) should be visible by the end user on an installed user (e.g. in the IE extensions control panel) so that the user can check wich version she has on her system and findout quickly if she needs to upgrade.