Merged develop into feature

--HG--
branch : feature

scripts/fix_png.sh

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+#!/bin/bash
+
+# The script helps to automate fixing issue "libpng warning: iCCP: known incorrect sRGB profile".
+# Main idea: https://stackoverflow.com/questions/22745076/libpng-warning-iccp-known-incorrect-srgb-profile
+
+# Use "pngcrush" to remove the incorrect sRGB profile from the png file
+# Link: http://pmt.sourceforge.net/pngcrush/
+
+# -ow will overwrite the input file
+# -rem allb will remove all ancillary chunks except tRNS and gAMA
+# -reduce does lossless color-type or bit-depth reduction
+
+#In the console output you should see "Removed the sRGB chunk.", and possibly more messages about chunk removals. 
+#You will end up with a smaller, optimized png file. As the command will overwrite the original file, make 
+#sure to create a backup or use version control.
+
+# IMPORTANT!!! Run script inside 'scripts' directory.
+
+# usage:
+# $ ./fix_png.sh
+
+find .. -type f -iname '*.png' -exec pngcrush -ow -rem allb -reduce {} \;