GitLab

* add configs corresponding to new models in the zoo.
* add warinings aboud version in notebook.

Also clarifies usage on label maps. In a nutshell, label map IDs
should start at index 1 (and not include 0).

For details see our paper:
"Speed/accuracy trade-offs for modern convolutional object detectors."
Huang J, Rathod V, Sun C, Zhu M, Korattikara A, Fathi A, Fischer I,
Wojna Z, Song Y, Guadarrama S, Murphy K, CVPR 2017
https://arxiv.org/abs/1611.10012