Update knowrob-base.rosinstall

Following the base install under ROS Hydro fails because rosjava_jni is not available as debian package. I suggest to include the source repo into the rosinstall-file. This worked smooth for me on Ubuntu 12.04 + ROS Hydro with a mixed rosbuild/catkin workspace.
Merge pull request #8 from airballking/patch-1

Update knowrob-base.rosinstall