Fix engine.io-client webpack load dependency

package.json

@@ -22,6 +22,7 @@
     "diff-match-patch": "git+https://github.com/hackmdio/diff-match-patch.git",
     "ejs": "^2.5.2",
     "emojify.js": "^1.1.0",
+    "engine.io-client": "^1.7.0",
     "express": ">=4.14",
     "express-session": "^1.14.1",
     "file-saver": "^1.3.3",
@@ -81,12 +82,12 @@
     "randomcolor": "^0.4.4",
     "raphael": "github:dmitrybaranovskiy/raphael",
     "request": "^2.75.0",
-    "reveal.js": "3.3.0",
+    "reveal.js": "^3.3.0",
     "sequelize": "^3.24.3",
     "sequelize-cli": "^2.4.0",
     "shortid": "2.2.6",
     "socket.io": "1.5.0",
-    "socket.io-client": "^1.4.8",
+    "socket.io-client": "^1.5.0",
     "sqlite3": "^3.1.6",
     "store": "^1.3.20",
     "string": "^3.3.1",

webpackBaseConfig.js

@@ -12,9 +12,6 @@ module.exports = {
             io: "socket.io-client",
             key: "keymaster"
         }),
-        new webpack.DefinePlugin({
-            "require.specified": "require.resolve"
-        }),
         new ExtractTextPlugin("[name].css"),
         new webpack.optimize.CommonsChunkPlugin({
             name: ["vendor", "public", "slide", "locale"],