Python 3 support (ros#122)

generated using 2to3

Author: mgrrx

scripts/class_loader_headers_update.py

@@ -34,7 +34,6 @@
 # Run this script to update legacy pluginlib macros to utilize new
 # simplified PLUGINLIB_EXPORT_CLASS macro.
 
-from __future__ import print_function
 
 import subprocess
 
@@ -59,8 +58,8 @@
 sed_cmd_suffix = ' {} \; '
 sed_separator = '@'
 full_cmd = cmd
-for old_header, new_header in header_mappings.iteritems():
-    for leading_token, ending_token in include_tokens.iteritems():
+for old_header, new_header in header_mappings.items():
+    for leading_token, ending_token in include_tokens.items():
         full_cmd += \
             sed_cmd_prefix + sed_separator + \
             include_prefix + leading_token + old_header + ending_token + sed_separator + \