Add experimental Webpack support. Works fine when no cache is involved, but I need to figure out a better story for cache integration as most builds that teams use likely include a cache enabled.

lib/BabelSVGTracker.js

@@ -0,0 +1,30 @@
+/**
+ *  A Babel "plugin/transformer" that just tracks unique <Icon.../>
+ *  JSX tags in your source code. Note that this does absolutely no
+ *  modifications - just accumulates the unique SVG uris for the mapping.
+ *
+ *  @param {Object} babel This will be auto-passed, most likely, by Babel.
+ *  @returns {Object} babel.Transformer used for the babel'ing. You know the one.
+ */
+module.exports = function(babel) {
+    var _packer = this;
+
+    return {
+        visitor: {
+            JSXElement: function JSXElement(node, parent, scope, file) {
+                if(_packer.opts.JSXTagNames.indexOf(node.node.openingElement.name.name) < 0)
+                    return;
+
+                var attributes = node.node.openingElement.attributes,
+                    l = attributes.length,
+                    i = 0;
+
+                for(; i < l; i++) {
+                    if(attributes[i].name.name !== 'uri') 
+                        continue;
+                    _packer.SVGS[attributes[i].value.value] = 1; 
+                }
+            }
+        }
+    };
+};