This mod adds better villager trades and new villagers, currently there are only a few things added:

Improved trades

Skilled farmer

New Villagers

Necromancer

(Current design is just a place holder)

Emerald Master

Items added

Farming table

used to get access to the new skilled farmer

Super Emerald

9 emerald blocks put into one to make an advanced trading station

Soul

used in trading to get spawn eggs