Rename the file denoted by this name. Note that StorageFile objects are immutable. This method renames the underlying file, it does not change this StorageFile object. The StorageFile object denotes the same name as before, however the exists() method will return false after the renameTo method executes successfully.
It is not specified whether this method will succeed if a file already exists under the new name.
@param newName the new name.
@return true if the rename succeeded, false if not.