Merge branch 'master' of https://github.com/jsk-ros-pkg/jsk_demos
install swi-prolog on travis
install swi-prolog for catkin on rosbuild too
install libjson-glib-dev
does not build jsk_semantic_map on travis
does not build jsk_2011_07_pr2_semantic on travis
Merge pull request #7 from garaemon/fix-travis-missing-swi-prolog

Fix travis missing swi prolog