Update file-like-object.class.ts

The "rawFile" variable should be annotated by "any", because it's an object in actual use. Otherwise, using “rawFile.xx” leads to tsLint's error

src/file-upload/file-like-object.class.ts

@@ -7,7 +7,7 @@ export class FileLikeObject {
   public size: any;
   public type: string;
   public name: string;
-  public rawFile: string;
+  public rawFile: any;
 
   public constructor(fileOrInput: any) {
     this.rawFile = fileOrInput;