Changes

WARNING: Host distribution "Ubuntu 13.04" has not been validated with this version of the build system; you may possibly experience unexpected failures. It is recommended that you use a tested distribution(see [http://www.yoctoproject.org/docs/1.4.2/ref-manual/ref-manual.html#detailed-supported-distros yocto validated distributions from yoctoproyect.org]).

Although denzil branch is not validated for "Ubuntu 13.04" , we have successfully build denzil images with this distribution, see notes below: