added infrastructure noise barrier

changelog.txt

@@ -1,12 +1,10 @@
-2016-06-18: Added several infrastructure signs
-
 2016-06-17: More changes
 * Added homedecor chainlink and barbed gates, fixed chainlink corner
 * Fixed streets steel support, added infrastructure truss
 * Added infrastructure 'riffled' sheet (diamond plate), corrugated
   sheet, galvanized steel block, wire netting and cable/rope barrier 
-  images, razor wire, paving stone and related grass, and most of the
-  various signs.
+  images, razor wire, paving stone and related grass, most of the
+  various signs, and noise barrier.
 
 2016-06-(16-17): A whole bunch of changes:
 * Added support for 0.4.14-style fences

image-credits.txt

@@ -787,7 +787,7 @@ https://www.reference.com/science/galvanized-metal-rust-b7210f0fbb2728d6
 https://commons.wikimedia.org/wiki/File:BarbedTape1.JPG
 https://en.wikipedia.org/wiki/File:Rasenpflasterstein_1.jpg
 http://mutcd.fhwa.dot.gov/pdfs/2009r1r2/mutcd2009r1r2edition.pdf
-
+https://commons.wikimedia.org/wiki/File:Radio_wave_absorbing_foam_1.jpg
 
 Technic
 -------