implement hosting domain creation

- implement domains.views.CreateHostingDomain
- define new URL create_hosting_domain in domains.urls
- add domains app URLs to gnuviechadmin.urls
- add templates domains/base.html and domains/hostingdomain_create.html
- link from hostingpackage detail page to domain creation view

gnuviechadmin/templates/domains/hostingdomain_create.html

@@ -0,0 +1,16 @@
+{% extends "domains/base.html" %}
+{% load i18n crispy_forms_tags %}
+{% block title %}{{ block.super }} - {% blocktrans with package=hostingpackage.name full_name=customer.get_full_name %}Add Domain to Hosting Package {{ package }} of Customer {{ full_name }}{% endblocktrans %}{% endblock title %}
+{% block page_title %}{% blocktrans with package=hostingpackage.name full_name=customer.get_full_name %}Add Domain to Hosting Package {{ package }} of Customer {{ full_name }}{% endblocktrans %}{% endblock page_title %}
+
+{% block content %}
+{% crispy form %}
+{% endblock content %}
+
+{% block extra_js %}
+<script type="text/javascript">
+$(document).ready(function() {
+  $('input[type=text]').first().focus();
+});
+</script>
+{% endblock extra_js %}