Spelling corrections

Basically correcting all instances of the expression "bellow", replacing
them with "below"
Merge pull request #3 from caparicajr/master

Grammar Nazi arrives! Basically correcting all instances of the expression 'bellow', replacing
them with 'below'
Change 'geophysical' for 'geophysics'. Better for search
Adding new ideas in TODO
Merge pull request #7 from hbueno/devel

Adding new ideas in TODO
Removed unused deprecated matplotlib import nxutils
Merge branch 'master' into devel
Removed TODO file and ported all notes to Github issues
Set blit=False in seismic wave recipe
Merge pull request #20 from hbueno/master

Set blit=False in seismic wave recipe
Update sphere.py - calculation of the gzz gravity gradient component

I modified the gz function for the purpose of calculate the gzz gravity gradient component.
Update sphere.py - corrected gzz function

I corrected a line indentation problem in the gzz function.
gzz function on sphere.py
cookbook gzz function and corrected from SI2EOTVOS import error
Merge pull request #24 from birocoles/devel

gzz function on sphere.py
Updated copyright notice in docs
Merge branch 'devel' of github.com:leouieda/fatiando into devel
Merge pull request #26 from leouieda/devel

Getting rid of devel branch
Added Andre to contributor list
Removed logger module. Cleaned all packages and respective recipes except gravmag