Module manifests should use https

[protoism]

The wizard for new application and new module create modules manifests using http URLs.
The protocol should be https, and the FQDN might be www.gwtproject.org.

Here an extract of a module created by the new application wizard:

<?xml version="1.0" encoding="UTF-8"?>
<!--
  When updating your version of GWT, you should also update this DTD reference,
  so that your app can take advantage of the latest GWT module capabilities.
-->
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.10.0//EN"
  "http://gwtproject.org/doctype/2.10.0/gwt-module.dtd">

[protoism]

The "new application" wizard delegates the project creation to the SDK. We can fix the DTD only for modules created with the new module wizard