chore(analysis): analyze web folders; fix existing warnings

modules/angular2/src/facade/collection.dart

@@ -154,6 +154,11 @@ class ListWrapper {
   static List slice(List l, int from, int to) {
     return l.sublist(from, to);
   }
+  static List splice(List l, int from, int to) {
+    var sub = l.sublist(from, to);
+    l.removeRange(from, to);
+    return sub;
+  }
   static void sort(List l, compareFn(a,b)) {
     l.sort(compareFn);
   }

modules/angular2/src/facade/collection.es6

@@ -193,6 +193,9 @@ export class ListWrapper {
   static slice(l:List, from:int, to:int):List {
     return l.slice(from, to);
   }
+  static splice(l:List, from:int, to:int):List {
+    return l.splice(from, to);
+  }
   static sort(l:List, compareFn:Function) {
     l.sort(compareFn);
   }