Do not add entry to an index if it's filtered out.

This will prevent calls to FileSystem.resolve on excluded entries to add them
to FileSystem index, thus avoiding generating fs events on these.

src/filesystem/FileSystem.js

@@ -544,7 +544,9 @@ define(function (require, exports, module) {
 
         if (!entry) {
             entry = new EntryConstructor(path, this);
-            this._index.addEntry(entry);
+            if (this._indexFilter(path, entry.name)) {
+                this._index.addEntry(entry);
+            }
         }
 
         return entry;