Improve crc32-based getValueHash method to work better on 32 and 64 b…

…it machines.

Creating tag 2.2.3

Create tag 2.2.2

Create tag 2.2.1

Create tag 2.2.0 (test suite, graph class)

Create tag v2.1.1 (2013-01-23)

version 2.1.0 from Nov 2012.

Tagged release 2.0.0