Replaces print statement with built in function (#428)

The print statement was removed with Python3, this change should work
for both Python2 and Python3.

Author: moriarty

tests/motor/ev3dev_port_logger.py

@@ -86,4 +86,4 @@ def execute_actions(actions):
      test['data'][p] = logs[p].results
 
 # Add a nice JSON formatter here - maybe?
-print json.dumps( test, indent = 4 )
+print (json.dumps( test, indent = 4 ))

tests/motor/plot_matplotlib.py

@@ -67,7 +67,7 @@
 
     # Clean up the chartjunk
     for i,ax in enumerate(axarr):
-        print i, ax
+        print(i, ax)
         # Remove the plot frame lines. They are unnecessary chartjunk.
         ax.spines["top"].set_visible(False)
 
@@ -84,4 +84,4 @@
                       verticalalignment='center',
                       transform = axarr[i].transAxes)
 
-        plt.savefig("{0}-{1}.png".format(args.infile,k), bbox_inches="tight")
+        plt.savefig("{0}-{1}.png".format(args.infile,k), bbox_inches="tight")