Changed a bunch of variables to use bitwise shift instead of multiplication and division

core/assets/gdx-texturepacker/readme.txt

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+Gdx Texture Packer GUI
+
+Simple utility to help you pack and manage texture atlases for LibGDX game framework. It's mostly just visual wrapper over LibGDX TexturePacker classes and offers more convenient way of using it.
+
+For further details visit GitHub project page:
+https://github.com/crashinvaders/gdx-texture-packer-gui
+
+Requirements:
+- Java 7 JRE (or higher) (can be donwnloaded here http://www.oracle.com/technetwork/java/javase/downloads/index.html)
+- OpenGL support
+
+How to launch:
+Application is packed into JAR executable file. To launch it, issue next command
+java -jar gdx-texturepacker.jar
+
+MacOS and UNIX
+You may execute launch.sh bash script to launch application
+
+Windows
+launch.bat - starts application
+launcher_no_cmd.vbs - does exactly what launch.bat does, but CMD window won't appear in that case
+
+
+If you got any questions or would like to share some ideas, reach me out at anton@crashinvaders.com
+
+Hope you will enjoy it!
+Anton Chekulaev