new README.md and HISTORY.md

src/imageloader/HISTORY.md

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+ImageLoader Change History
+==========================
+
+3.4.0
+-----
+  * Added classNameAction option for ImgGroup. Setting to "enhanced" means that
+   when using className on an <img> element, the src attribute is replaced
+   rather than simply removing the class name. [Ticket #2530087]
+
+3.3.0
+-----
+  * No change
+
+3.2.0
+-----
+  * No change
+
+3.1.1
+-----
+  * No change
+
+3.1.0
+-----
+  * PNG image fix for IE6 [Ticket #2528448]
+  * Convert deprecated Y.get calls to Y.one
+
+3.0.0
+-----
+  * No change
+
+3.0.0 beta 1
+------------
+  * 3.0 conversion
+  * New features:
+    * Fold groups indicated by a distance from the fold, and images are
+      loaded in cascading fashion as each reaches that distance
+      Scroll and resize triggers are set automatically for these groups
+    * Custom triggers can belong to the global Y instance or to any local event
+      target
+    * Bg, Src, and Png images are all registered with groups via the same
+      "registerImage" method, and differentiated by attribute parameters
+

src/imageloader/README.md

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+ImageLoader
+===========
+
+Provides dynamic loading of images according to user-event triggers, fold
+location, or time limits