Add flask_table for admin view

app/main/views.py

@@ -1,4 +1,6 @@
 from flask import render_template
+from ..models import User
+from ..tables import AdminUserTable, AdminUserItem
 from . import main
 from ..decorators import admin_required
 from flask_login import login_required
@@ -13,4 +15,8 @@ def index():
 @login_required
 @admin_required
 def for_admins_only():
-    return "For administrators!"
+    users = User.query.order_by(User.username).all()
+    items = [AdminUserItem(u.username, u.email, u.role_id, u.confirmed) for u in users]
+    table = AdminUserTable(items)
+    return render_template('main/admin.html.j2', title='Administration Tools',
+                           table=table.__html__())