- adding Timing PID

	modified:   CMakeLists.txt
	modified:   src/components/TimingPID.cpp

	modified:   src/components/TimingPID.cpp

Added skeleton RingImagePID

- This should be used for RICH-based  PID

Added skeleton ElectronPID algo

Fixed typo
	modified:   ElectronPID.cpp
	modified:   RingImagePID.cpp
	modified:   TimingPID.cpp

	modified:   ElectronPID.cpp
	modified:   RingImagePID.cpp
	modified:   TimingPID.cpp

Fixed missing return value

	modified:   ElectronPID.cpp
	modified:   RingImagePID.cpp
	modified:   TimingPID.cpp