Add hparams of models used in paper (except for sv2p).

hparams/bair/ours_deterministic_l1/model_hparams.json

hparams/bair/ours_deterministic_l2/model_hparams.json

hparams/bair/ours_gan/model_hparams.json

hparams/bair/ours_vae_gan/model_hparams.json

hparams/bair/ours_vae_l1/model_hparams.json

hparams/bair/ours_vae_l2/model_hparams.json

hparams/bair/sna_l1/model_hparams.json

hparams/bair/sna_l2/model_hparams.json

...bair_action_free/ours_deterministic_l1/model_hparams.json

...bair_action_free/ours_deterministic_l2/model_hparams.json

hparams/bair_action_free/ours_gan/model_hparams.json

hparams/bair_action_free/ours_vae_gan/model_hparams.json

hparams/bair_action_free/ours_vae_l1/model_hparams.json

hparams/bair_action_free/ours_vae_l2/model_hparams.json

hparams/kth/ours_deterministic_l1/model_hparams.json

hparams/kth/ours_deterministic_l2/model_hparams.json

hparams/kth/ours_gan/model_hparams.json

hparams/kth/ours_vae_gan/model_hparams.json

hparams/kth/ours_vae_l1/model_hparams.json