Added Changelog between 1.1 and 1.2-beta1.

git-svn-id: http://svn.aircrack-ng.org/trunk@2296 28c6078b-6c39-48e3-add9-af49d547ecab
Updated README.

git-svn-id: http://svn.aircrack-ng.org/trunk@2297 28c6078b-6c39-48e3-add9-af49d547ecab