Update to html-webpack-plugin v2

This is still a prerelease, but it's almost finished so updating it on this branch is no problem. Thanks to @jantimon for the amazing work.

v2 lets you load html files with loaders, so we now use html-loader to load the index.html file, which automatically require()s all img tags specified in the HTML file. This doesn't yet solve the meta image problem, but I've added to an issue in the html-loader repo and hope that this will be resolved soon! See webpack-contrib/html-loader#17

package.json

@@ -35,7 +35,8 @@
     "expect-jsx": "2.2.1",
     "extract-text-webpack-plugin": "0.9.1",
     "file-loader": "^0.8.4",
-    "html-webpack-plugin": "^1.6.1",
+    "html-loader": "0.4.0",
+    "html-webpack-plugin": "^2.6.1",
     "ip": "1.1.0",
     "json-loader": "^0.5.2",
     "mocha": "^2.3.2",

webpack/makewebpackconfig.js

@@ -147,6 +147,10 @@ module.exports = function(options) {
         }, {
           test: /\.jpe?g$|\.gif$|\.png$/i,
           loader: "url-loader?limit=10000"
+        },
+        {
+          test: /\.html$/,
+          loader: 'html-loader'
         }
       ]
     },