use pip instead of setup.py in fabric command

docs/patterns/fabric.rst

@@ -43,37 +43,26 @@ virtual environment::
     env.hosts = ['server1.example.com', 'server2.example.com']
 
     def pack():
-        # create a new source distribution as tarball
+        # build the package
         local('python setup.py sdist --formats=gztar', capture=False)
 
     def deploy():
-        # figure out the release name and version
+        # figure out the package name and version
         dist = local('python setup.py --fullname', capture=True).strip()
-        # upload the source tarball to the temporary folder on the server
-        put('dist/%s.tar.gz' % dist, '/tmp/yourapplication.tar.gz')
-        # create a place where we can unzip the tarball, then enter
-        # that directory and unzip it
-        run('mkdir /tmp/yourapplication')
-        with cd('/tmp/yourapplication'):
-            run('tar xzf /tmp/yourapplication.tar.gz')
-            # now setup the package with our virtual environment's
-            # python interpreter
-            run('/var/www/yourapplication/env/bin/python setup.py install')
-        # now that all is set up, delete the folder again
-        run('rm -rf /tmp/yourapplication /tmp/yourapplication.tar.gz')
-        # and finally touch the .wsgi file so that mod_wsgi triggers
-        # a reload of the application
+        filename = '%s.tar.gz' % dist
+
+        # upload the package to the temporary folder on the server
+        put('dist/%s' % filename, '/tmp/%s' % filename)
+
+        # install the package in the application's virtualenv with pip
+        run('/var/www/yourapplication/env/bin/pip install /tmp/%s' % filename)
+
+        # remove the uploaded package
+        run('rm -r /tmp/%s' % filename)
+
+        # touch the .wsgi file to trigger a reload in mod_wsgi
         run('touch /var/www/yourapplication.wsgi')
 
-The example above is well documented and should be straightforward.  Here
-a recap of the most common commands fabric provides:
-
--   `run` - executes a command on a remote server
--   `local` - executes a command on the local machine
--   `put` - uploads a file to the remote server
--   `cd` - changes the directory on the serverside.  This has to be used
-    in combination with the ``with`` statement.
-
 Running Fabfiles
 ----------------