No need to run pip install pyScss in setup.py if it's not available

setup.py

@@ -3,8 +3,6 @@
 import errno
 import os
 import re
-import subprocess
-import sys
 import distutils.cmd
 from distutils.command.build import build
 from setuptools import setup, find_packages
@@ -23,15 +21,9 @@ class WebBuildCommand(distutils.cmd.Command):
         try:
             from scss import Compiler
         except ImportError:
-            print('pyScss not found, trying to install it')
-            cmd = [sys.executable, '-m', 'pip', 'install', 'pyScss']
-
-            try:
-                subprocess.call(cmd)
-            except Exception as e:
-                print(('pyScss install command failed: {}: {}. You will have to generate ' +
-                    'the CSS files manually through python setup.py build install').format(' '.join(cmd), str(e)))
-                return
+            print('pyScss module not found: {}. You will have to generate ' +
+                  'the CSS files manually through python setup.py build install')
+            return
 
         print('Building CSS files')
         base_path = path(os.path.join('platypush','backend','http','static','css'))