Fix for  #225, #168

Fix for #225, #168 
- Add `durability`
- Add `groupFormat`
- Update syntax for run for the JS driver
- Remove all the arguments for `run` in `index.md` because we have too many now.


I forked from master by mistake, so you can ignore the changes on `4-rethinkdb-in-practice/frameworks-and-libraries.md`

@coffeemug -- could you take a quick look when you have some time?