Merge pull request volatilityfoundation#572 from atoptsoglou/patch-1

Bump to 2.6.1

Volatility 2.6 Release

Volatility 2.5 Release

Update CREDITS.txt

Update constants.py

Bump to 2.4

Bump to volatility 2.3.1.

Version bump to volatility 2.3 release.

fix a unicode decode error in ldrmodules reported by David Kovar

Version bump to 2.1.

Finally bump to volatility 2.0.