Fix tacker_horizon package namespace and README instruction

README.md

@@ -8,7 +8,7 @@ Installation
 1. Install module
 
     ```
-    pip install tacker-horizon
+    sudo python setup.py install
     ```
 
 2. Copy files to Horizon tree

tacker_horizon/__init__.py

@@ -0,0 +1,16 @@
+# Copyright 2015 Brocade Communications System, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+__import__('pkg_resources').declare_namespace(__name__)