Added python-simplejson line to setup_ubuntu.sh.

camlib.py

@@ -2194,7 +2194,6 @@ class CNCjob(Geometry):
         else:
             self.zdownrate = None
 
-
         # Attributes to be included in serialization
         # Always append to it because it carries contents
         # from Geometry.

setup_ubuntu.sh

@@ -2,6 +2,7 @@
 apt-get install libpng-dev
 apt-get install libfreetype6 libfreetype6-dev
 apt-get install python-dev
+apt-get install python-simplejson
 apt-get install python-qt4
 apt-get install python-numpy python-scipy python-matplotlib
 apt-get install libgeos-dev