Introduced a PgAdmin class inherited from the Flask, which looks for

submodules inherited from the PgAdminModule instead of regular
Blueprint. This allows us to load the module automatically from the
under the pgadmin directory, and will work to extend the pgAdmin
extension module.

PgAdminModule is inherited from the Blueprint, and bring several
methods:
-  get_own_stylesheets, which returns the stylesheets used by the module
   (excluding its submodules stylesheets)
- get_own_javascripts
- menu_items, which returns a dictionray mapping the old hook names
  (context_items etc) to a list of MenuItem instances

For more specialized modules (as for now, any module that should be part
of the browser tree construction), one can define an abstract base class
defining additional methods.

For example, the BrowserPluginModule abstract base class defines the
following methods:
- jssnippets
- csssnipeets
- node_type
- get_nodes

web/pgadmin/redirects/__init__.py

@@ -0,0 +1,19 @@
+from pgadmin import PgAdminModule
+from flask.ext.security import login_required
+from flask import redirect, url_for
+
+MODULE_NAME = 'redirects'
+
+blueprint = PgAdminModule(MODULE_NAME, __name__,
+                          url_prefix='/')
+
+@blueprint.route('/')
+@login_required
+def index():
+    """Redirect users hitting the root to the browser"""
+    return redirect(url_for('browser.index'))
+
+@blueprint.route('/favicon.ico')
+def favicon():
+    """Redirect to the favicon"""
+    return redirect(url_for('static', filename='favicon.ico'))

web/pgadmin/redirects/views.py

@@ -1,29 +0,0 @@
-##########################################################################
-#
-# pgAdmin 4 - PostgreSQL Tools
-#
-# Copyright (C) 2013 - 2015, The pgAdmin Development Team
-# This software is released under the PostgreSQL Licence
-#
-##########################################################################
-
-"""A blueprint module providing URL redirects."""
-MODULE_NAME = 'redirects'
-
-import config
-from flask import Blueprint, redirect, url_for
-from flask.ext.security import login_required
-
-# Initialise the module
-blueprint = Blueprint(MODULE_NAME, __name__)
-
-@blueprint.route('/')
-@login_required
-def index():
-    """Redirect users hitting the root to the browser"""
-    return redirect(url_for('browser.index'))
-
-@blueprint.route('/favicon.ico')
-def favicon():
-    """Redirect to the favicon"""
-    return redirect(url_for('static', filename='favicon.ico'))