add libjson-perl for 12.04

Former-commit-id: 0f178c2475

install.sh

@@ -118,7 +118,7 @@ sudo apt-get install --assume-yes --install-recommends \
   libjpeg-dev libboost1.48-all-dev libgsl0-dev libx11-dev libxext-dev liblapack-dev \
   libeigen3-dev libflann-dev libvtk5-dev libqhull-dev libusb-1.0-0-dev\
   libzip-dev \
-  libswitch-perl \
+  libswitch-perl libjson-perl \
   libcv-dev libcvaux-dev libopencv-dev \
   > "$TOOLS_LOG_PATH/apt-get_install.log" 2>&1
 else