Add new logo and reorganize the folders

logo/Makefile

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+# This Makefile creates the logo in different formats based on the svg version
+#  in svg/codebar-logo.svg. A Makefile specifies how a specific file should
+#  be created. If that file needs a different file to work on,  e.g. like the
+#  jpg files that need the png files, Make will create the png's first using
+#  the recipe specified for them.
+#
+# To create the images, make, imagemagick and inkscape need to be installed.
+# On Mac, make should come with XCode (https://developer.apple.com/xcode/),
+#  imagemagick can be installed using brew (`brew install imagemagick`)
+#  and inkscape is available as a package from https://inkscape.org/
+#
+# On Linux, all three applications should be available in your package-manager
+#  where `make` comes with `build-essentials` on Ubuntu & `base-devel` on Arch
+#
+# If you want to update all rasterized versions, issuing `make all` should
+#  re-create all files. If Make reports `make: Nothing to be done for 'all'.`,
+#  that means the source file (the svg) hasn't changed and thus Make does not
+#  need to recreate the rasterized versions.
+#
+# If you want to force re-creation, issue `make clean`, which will delete all
+#  rasterized versions and then will force `make all` to re-create them.
+
+# Create all derived formats using the recipes below
+all: eps/codebar-logo.eps png/codebar-logo.png png/codebar-logo-160x160.png png/codebar-logo-300x300.png jpg/codebar-logo.jpg jpg/codebar-logo-160x160.jpg jpg/codebar-logo-300x300.jpg
+
+# clean is .PHONY because it doesn't create a file.
+#  it will delete all derived files. Usually you won't need this.
+#  (https://www.gnu.org/software/make/manual/html_node/Phony-Targets.html)
+.PHONY: clean
+clean:
+	rm eps/codebar-logo.eps
+	rm png/codebar-logo*.png
+	rm jpg/codebar-logo*.jpg
+
+# Create an EPS version of the logo
+#
+# A 'target' can be read as
+# > In order to create eps/codebar-logo.eps
+# > Issue the following command that requires svg/codebar-logo.svg to be present
+eps/codebar-logo.eps: svg/codebar-logo.svg
+	inkscape -z -E eps/codebar-logo.eps svg/codebar-logo.svg
+
+# Create the logo as a PNG at different resolutions (300dpi, 160x160px, 300x300px)
+png/codebar-logo.png: svg/codebar-logo.svg
+	inkscape -z -e png/codebar-logo.png -d 300 svg/codebar-logo.svg
+
+png/codebar-logo-160x160.png: svg/codebar-logo.svg
+	inkscape -z -e png/codebar-logo-160x160.png -w 160 svg/codebar-logo.svg
+
+png/codebar-logo-300x300.png: svg/codebar-logo.svg
+	inkscape -z -e png/codebar-logo-300x300.png -w 300 svg/codebar-logo.svg
+
+# '-background white -alpha remove' so that transparency is replaced with white
+#  as convert would by default replace transparency (alpha) with black.
+# command uses 'png/codebar-logo' as a source because convert is bad at
+#  converting the source file, the svg, so we use the already rasterized png.
+#
+# If the corresponding png is not present, Make will issue the command above
+#  to create the png file from the svg first.
+jpg/codebar-logo.jpg: png/codebar-logo.png
+	convert png/codebar-logo.png -background white -alpha remove jpg/codebar-logo.jpg
+
+jpg/codebar-logo-160x160.jpg: png/codebar-logo-160x160.png
+	convert png/codebar-logo-160x160.png -background white -alpha remove jpg/codebar-logo-160x160.jpg
+
+jpg/codebar-logo-300x300.jpg: png/codebar-logo-300x300.png
+	convert png/codebar-logo-300x300.png -background white -alpha remove jpg/codebar-logo-300x300.jpg