Bump version to 0.4.2

Highlight of the release are proper accounting for subscription
status when checking permissions to use a device.

Author: xrmx

setup.py

@@ -8,7 +8,7 @@
 except ImportError:
     from distutils.core import setup
 
-version = '0.4.1'
+version = '0.4.2'
 
 setup(
     name='labAdmin',