Updating README.md
Updating README.md

Adding list of maintainers
Changing model links to point to tensorflow/models repository.

xcyan/models,wangyang59/tf_models,jiaphuan/models,sshleifer/object_detection_kitti,r888888888/models,tombstone/models,jazcollins/models,alexgorban/models,wangyang59/tf_models,bousmalis/models,alexgorban/models,hang-qi/models,tombstone/models,derekjchow/models,hang-qi/models,xcyan/models,jiaphuan/models,jch1/models,beomyeol/models,derekjchow/models,alexgorban/models,hang-qi/models,hang-qi/models,xcyan/models,jazcollins/models,hang-qi/models,tombstone/models,tombstone/models,derekjchow/models,xcyan/models,jch1/models,sshleifer/object_detection_kitti,jazcollins/models,jazcollins/models,jazcollins/models,jch1/models,jazcollins/models,sshleifer/object_detection_kitti,jiaphuan/models,r888888888/models,bousmalis/models,sshleifer/object_detection_kitti,wangyang59/tf_models,derekjchow/models,r888888888/models,jiaphuan/models,cshallue/models,alexgorban/models,bousmalis/models,jch1/models,alexgorban/models,cshallue/models,sshleifer/object_detection_kitti,cshallue/models,zbigniewwojna/text-rcnn,bousmalis/models,xcyan/models,sshleifer/object_detection_kitti,r888888888/models,jiaphuan/models,jiaphuan/models,r888888888/models,hang-qi/models,cshallue/models,bousmalis/models,derekjchow/models,wangyang59/tf_models,tombstone/models,jch1/models,wangyang59/tf_models,beomyeol/models,beomyeol/models,tombstone/models,r888888888/models,bousmalis/models,jch1/models,wangyang59/tf_models,xcyan/models,cshallue/models