add docs for negative legend stuffs per #28, fix tabs on other countries section docs
add docs for negative legend stuffs per #28, fix tabs on other countries section docs

melalj/maptable,Packet-Clearing-House/maptable,melalj/maptable,Packet-Clearing-House/maptable,melalj/maptable,Packet-Clearing-House/maptable,Packet-Clearing-House/maptable,melalj/maptable,melalj/maptable