Possible new logo

Trying out a different logo design:

![fatiando-banner-with-url](https://raw.githubusercontent.com/fatiando/logo/logo-redesign/fatiando-banner-with-url.png)

# Concept

The Earth is split into 3. Half is the actual map. 1/3 is like a reference Earth, with crust, mantle, core. The other is a more realistic Earth with tectonics and geophysical processes, like seismic waves, geodynamo, volcanoes, gravity (represented by plumb lines and GOCE flying around), etc.

**What do you think?** @fatiando/contributors