v0.4.2: Always use boost::optional to resolve compatibility issue

v0.4.1: Fixed pacman package distribution and cmake configuration

v0.4.0: Lots of refactoring

- Can build with clang4 + libstdc++6
- Cross build packages for Raspberry Pi
- libprotobuf.so is now external dependency
- Use Eigen internally instead of Boost.QVM
- Add documentation
- Add configuration files for cmake and pkg-config
- And some small improvements

v0.3.1: Compare flom::Motion properly

v0.3: Many refactoring to improve stability and maintainability

v0.2: with basic API features

v0.1: Initial release