Added many useful features.
      * To create symlinks, hardlinks for all the files
      * Able to do chmod on all the files created.
      * Use of random name is optional, otherwise it use
        file0,file1 .. kind of naming for files.
      * Default size of the files is 100K now , not random.
      * proper logging of a file.
      * able to calculate the write through put after the
        creation of files.

Signed-off-by: Vijaykumar Koppad <vijaykumar.koppad@gmail.com>