Version 1.1.1 (Sep 5, 2012)
  - Revised function names to be consistent with the MSST'12 paper. 

Version 1.1.0 (Aug 23, 2012)
  - Fix bugs on memory leak
  - Implement heterogeneous replace recovery algorithm, which is designed 
    for stoage environments, composed by nodes with heterogeneous capabilities. 

Version 1.0.0 (Mar 23, 2012)
    - First release