Removed the redundant number parameter from BrewerMap init method and added BrewerMap to the list of things imported into the root namespace. This will make it easier to, for example, create custom color maps by mixing and matching the existing ones.
Removed the redundant number parameter from BrewerMap init method and added BrewerMap to the list of things imported into the root namespace. This will make it easier to, for example, create custom color maps by mixing and matching the existing ones.

brorfred/palettable,mikecharles/palettable,chebee7i/palettable