align installation doc with other tendr projects

doc/source/installation.rst

@@ -10,15 +10,43 @@ Environment
 Installation
 ============
 
+Since there is no stable release yet, the only option is to install the project
+from the source.
 
-1. Install http://github.com/tendrl/bridge_common
-2. Install http://github.com/tendrl/ceph_bridge
-    At the command line::
+Development version from the source
+-----------------------------------
+
+1. Install http://github.com/tendrl/bridge_common from the source code::
+
+    $ git clone https://github.com/Tendrl/bridge_common.git
+    $ cd bridge_common
+    $ mkvirtualenv ceph_bridge
+    $ pip install .
+
+2. Install ceph bridge itself::
+
+    $ git clone https://github.com/Tendrl/ceph_bridge.git
+    $ cd ceph_bridge
+    $ workon ceph_bridge
+    $ pip install .
+
+Note that we use virtualenvwrapper_ here to activate ``ceph_bridge`` `python
+virtual enviroment`_. This way, we install *ceph bridge* into the same virtual
+enviroment which we have created during installation of *bridge common*.
+
+.. _virtualenvwrapper: https://virtualenvwrapper.readthedocs.io/en/latest/
+.. _`python virtual enviroment`: https://virtualenv.pypa.io/en/stable/
+
+3. Create config file::
 
-    $ python setup.py install
     $ cp etc/tendrl/tendrl.conf.sample /etc/tendrl/tendrl.conf
 
-4. Edit /etc/tendrl/tendrl.conf as required
-5. mkdir /var/log/tendrl
-6. Run
-    $ tendrl-ceph-bridge
+4. Edit ``/etc/tendrl/tendrl.conf`` as required
+
+5. Create log dir::
+
+    $ mkdir /var/log/tendrl
+
+6. Run::
+
+    $ tendrl-ceph-bridge