[gegl] Created editor.txt and added some desired features

[Isaac Wagner <isaacbw src gnome org>]

commit db00f5e75824a18145140866676a1d4b82a37359
Author: Isaac Wagner <isaacbw src gnome org>
Date:   Thu Apr 26 16:32:07 2012 -0400

    Created editor.txt and added some desired features

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+This document outlines development on the node editor for 2012 Google Summer of Code
+
+Isaac Wagner
+isaacbw src gnome org
+
+
+DESIRED FEATURES
+================
+
+*Resizable image preview thumbnails on nodes
+*Text annotations
+*Automatic graph layouts
+*Bezier curve pad connections
+*Undo/redo
+*Adding nodes from a list or by typing the name in manually
+*Copy and paste of single nodes or groups of nodes, preserves properties
+*Grayscale Mask Node - includes primitive painting interface for creating grayscale mask inputs directly in the editor
+*Load meta-ops from XML
+*Store node position data in composition XML file
+*Auto-arrange loaded compositions if no positional data is present
+*Display properties directly on node
+*Standard keyboard shortcuts for undo/redo, copy/paste, deleting nodes
+*Can embed image data in composition XML with data URIs or simply reference files with Load nodes