realtime_object_detection 2.0

This release merges the realtime_object detection v1 and realtime_segmentation projects.
It includes the following features:

• all development that went into v1 (split_model speed hack etc.)
• usage of all research/object_detection and research/deeplab models
• scripts for statistical inference test runs on sample /test_images
• scripts to summarize, inspect and transform all models