[maven-release-plugin] prepare release finmath-lib-1.2.13

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@1027 48fcbb9e-5639-0410-8b25-842128a4905d
[maven-release-plugin] prepare for next development iteration

git-svn-id: http://svn.finmath.net/finmath%20lib/trunk@1029 48fcbb9e-5639-0410-8b25-842128a4905d