Added lint support for prediction module.

* add tool to easily update configuration files

* add a setter for state covariance in kalman filter for future use (#205)

* Migrate control/base_types.h to proto. (#203)

* Limit aggressive steering based on vehicle speed (#206)

* Fix function name conflict in apollo.sh and scripts/apollo_base.sh

* Simple code refactoring.

* Small code tweaks in can_receiver

* Migrate planning/common/base_types.h to proto.

* Remove useless code in apollo.sh. (#213)

* Enable travis ci build.

* added travis-ci build status in README

* Remove cache from travis ci. (#215)

* Add unitest to travis ci. (#216)

* Fix ci test failures. (#217)

* add some getters to kalmanFilter.h for future use.