Diff drive 2

This PR is on top of branch dynamic_sensor_param thus I'm pushing there.
It replaces !93 (closed) and is ready for review.

• add CaptureVelocity
• add CaptureWheelJointPosition
• add SensorDiffDrive
• add ProcessorDiffDrive
• add FeatureDiffDrive
• add ConstraintDiffDrive

Added also an example with data : $ ./test_processor_diff_drive path/to/wolf/src/test/data/diff_drive/wheel_data.dat 1.

src/captures/CMakeLists.txt

@@ -3,7 +3,9 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 # Forward var to parent scope
 
 SET(HDRS_CAPTURE ${HDRS_CAPTURE}
-                 ${CMAKE_CURRENT_SOURCE_DIR}/capture_velocity.h PARENT_SCOPE)
+                 ${CMAKE_CURRENT_SOURCE_DIR}/capture_velocity.h
+                 ${CMAKE_CURRENT_SOURCE_DIR}/capture_wheel_joint_position.h PARENT_SCOPE)
 
 SET(SRCS_CAPTURE ${SRCS_CAPTURE}
-                 ${CMAKE_CURRENT_SOURCE_DIR}/capture_velocity.cpp PARENT_SCOPE)
+                 ${CMAKE_CURRENT_SOURCE_DIR}/capture_velocity.cpp
+                 ${CMAKE_CURRENT_SOURCE_DIR}/capture_wheel_joint_position.cpp PARENT_SCOPE)