Bump up SO revision.

ChangeLog: Fix header. It should state -RC4 not -RC3.

Merge branch '1.1.x' of github.com:log4cplus/log4cplus into 1.1.x

Merge pull request log4cplus#68 from wilx/1.2.x

1.2.0-RC3

Bump SO version for new interfaces.

ChangeLog: Update for 1.2.0-RC2.

Merge pull request log4cplus#30 from wilx/1.1.x

Merge.

scripts/prepare_dist_from_git.sh: Check out requested branch and not …

…HEAD.

Propagate version 1.1.3 through the source.

ChangeLog: Update for 1.1.2 release.