Various errors generated from a Devise migration

[johnhamelink]

Hey there,

This AR Migration: https://gist.github.com/johnhamelink/d4b2da980fdf3cadbbbf
Is producing this Ecto Migration: https://gist.github.com/johnhamelink/8a1ef5896e988e898cdc#file-20150803133710_devise_create_sessions-exs-L4

• Line 4 has an extra ).
• def change should be def change do
• The index migrations have trailing commas.