Remove explicit Python versions from example configurations

examples/console/installer.cfg

@@ -5,8 +5,5 @@ entry_point=guessnumber:main
 # We need to set this to get a console:
 console=true
 
-[Python]
-version=3.4.0
-
 [Include]
 packages=guessnumber

examples/pyqt/installer.cfg

@@ -3,9 +3,6 @@ name=List App (PyQt)
 version=1.0
 entry_point=listapp:main
 
-[Python]
-version=3.3.5
-
 [Include]
 packages=listapp
     PyQt4

examples/tkinter/installer.cfg

@@ -3,8 +3,5 @@ name=My App
 version=1.0
 entry_point=exampleapp:main
 
-[Python]
-version=3.4.0
-
 [Include]
 packages=exampleapp