switched to ImageRole image loading and added perl script to generate images

share/goodie/guitar_chords/README

@@ -0,0 +1,3 @@
+generate.pm generates the images used by the GuitarChords goodie.
+
+Run `make` to run the perl script and create the .pngs and `make clean` to delete them (if necessary).

share/goodie/guitar_chords/generate.pm

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+use GD::Tab::Guitar;
+use IO::File;
+
+my $gtr = GD::Tab::Guitar->new;
+for my $chord (@{$gtr->all_chords}) {
+    my $filename = $chord;
+    my $file = IO::File->new("$filename.png", 'w');
+    $file->print($gtr->chord($chord)->png);
+}

share/goodie/guitar_chords/makefile

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+all:
+	@perl generate.pm
+	@echo done generating
+
+clean:
+	@rm *.png
+	@echo done cleaning