fix: use projectionMatrix() for indigo

DO NOT MERGE UNTIL REVIEWED BY SOMEONE

I'm not confident with this fix, but current version cause error on indigo
```
/home/k-okada/catkin_ws/ws_jsk_pcl_ros/src/jsk_recognition/jsk_perception/src/point_pose_extractor.cpp: In member function ‘bool Matching_Template::estimate_od(ros::ServiceClient, cv::Mat, std::vector<cv::KeyPoint>, image_geometry::PinholeCameraModel, double, cv::Mat&, cv::flann::Index*, posedetection_msgs::Object6DPose*)’:
/home/k-okada/catkin_ws/ws_jsk_pcl_ros/src/jsk_recognition/jsk_perception/src/point_pose_extractor.cpp:355:84: error: no matching function for call to ‘image_geometry::PinholeCameraModel::projectionMatrix(cv::Range, cv::Range)’
     cv::Mat camera_matrix = pcam.projectionMatrix(cv::Range::all(), cv::Range(0, 3));
                                                                                    ^
/home/k-okada/catkin_ws/ws_jsk_pcl_ros/src/jsk_recognition/jsk_perception/src/point_pose_extractor.cpp:355:84: note: candidate is:
In file included from /home/k-okada/catkin_ws/ws_jsk_pcl_ros/src/jsk_recognition/jsk_perception/src/point_pose_extractor.cpp:14:0:
/opt/ros/indigo/include/image_geometry/pinhole_camera_model.h:306:27: note: const Matx34d& image_geometry::PinholeCameraModel::projectionMatrix() const
 inline const cv::Matx34d& PinholeCameraModel::projectionMatrix() const { return P_; }
                           ^

```