Add missing future imports for print_function

There are some places where `print()` is used to print a blank line.
However, unless the future feature `print_function` is imported,
that will print `()` in Python 2.

plugins/Math/test.py

@@ -28,6 +28,8 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
+from __future__ import print_function
+
 from supybot.test import *
 
 class MathTestCase(PluginTestCase):

plugins/News/test.py

@@ -27,6 +27,8 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
+from __future__ import print_function
+
 import time
 
 from supybot.test import *

scripts/supybot-plugin-create

@@ -30,6 +30,8 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
+from __future__ import print_function
+
 import supybot
 
 import os

scripts/supybot-wizard

@@ -30,6 +30,8 @@
 # POSSIBILITY OF SUCH DAMAGE.
 ###
 
+from __future__ import print_function
+
 import os
 import sys