Add 1.9.6 and 1.9.7 to versions.json so that they show up on the website
Add 1.9.6 and 1.9.7 to versions.json so that they show up on the website

mdtraj/mdtraj,mdtraj/mdtraj,gph82/mdtraj,gph82/mdtraj,gph82/mdtraj,mdtraj/mdtraj,rmcgibbo/mdtraj,rmcgibbo/mdtraj,rmcgibbo/mdtraj