Improvements

• Added Python script that uses API to generate training data in KITTI format.
• Added examples to showing how to create and test various scenarios using Python API.
• Added Shalun map annotations, fixed missing collider.
• Improved traffic junction annotations for San Francisco, Shalun and SimpleMap.
• Speedbump annotation and export for Apollo hdmap.

Bugfixes

• Changed protobuf serialization library to protobuf-net. This fixes issue where Apollo 3.5 sometimes lost control of vehicle due to mismatch in protobuf serialization.
• Publishing IMU message in more uniform interval, fixes #138
• Fixed memory leak that happened for every get bounding_box Python API call.
• Fixed NPC vehicle speed when making NPC follow waypoints with Python API.
• Fixed segmentation camera when used from Python API, it was not initialized correctly.

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