Fix "Invalid calling object" in Edge and ES6 syntax error in IE

* Wrap indirect `setImmediate` into function to prevent "Invalid calling object" error in IE/Edge (due to a bug it's an error to call `setImmediate` indirectly).
* Fix `babel-loader` include condition to transpile `rdf-canonize` dependency.

.browserslistrc

@@ -0,0 +1 @@
+ie 10

lib/util.js

@@ -30,12 +30,12 @@ api.IdentifierIssuer = IdentifierIssuer;
 // from https://github.com/caolan/async/blob/master/lib/async.js
 
 // capture the global reference to guard against fakeTimer mocks
-const _setImmediate = typeof setImmediate === 'function' && setImmediate;
+const _setImmediate = typeof setImmediate === 'function'
+  // not a direct alias to prevent "Invalid calling object" error in IE and Edge
+  ? fn => setImmediate(fn)
+  : undefined;
 
-const _delay = _setImmediate ?
-  // not a direct alias (for IE10 compatibility)
-  fn => _setImmediate(fn) :
-  fn => setTimeout(fn, 0);
+const _delay = _setImmediate || (fn => setTimeout(fn, 0));
 
 if(typeof process === 'object' && typeof process.nextTick === 'function') {
   api.nextTick = process.nextTick;

webpack.config.js

@@ -60,13 +60,10 @@ outputs.forEach(info => {
       rules: [
         {
           test: /\.js$/,
-          include: [{
-            // exclude node_modules by default
-            exclude: /(node_modules)/
-          }, {
-            // include rdf-canonize
-            include: /(node_modules\/rdf-canonize)/
-          }],
+          include: [
+            path.join(__dirname, 'lib'),
+            path.join(__dirname, 'node_modules', 'rdf-canonize'),
+          ],
           use: {
             loader: 'babel-loader',
             options: {