Merged in marius_stanciu/flatcam_mpl/Fix_Follow_command_for_Python3 (pull request #100)

Fixed Follow Tcl command module imports for Python3

tclCommands/TclCommandFollow.py

@@ -1,8 +1,7 @@
-from ObjectCollection import *
-import TclCommand
+from tclCommands.TclCommand import *
 
 
-class TclCommandFollow(TclCommand.TclCommandSignaled):
+class TclCommandFollow(TclCommandSignaled):
     """
     Tcl shell command to follow a Gerber file
     """