gris 0.1.0

replace llh2xyz with geocentric, driving proj4 'geocent'
removed quadmeshFromRaster (see quadmesh package on CRAN)
many updates to align to spbabel
updated dplyr::distinct usage

gris 0.0.6.9001

Added a NEWS.md file to track changes to the package.
renamed bgl to quadmeshFromRaster
added detail to help topic gris-package
cleaned up some functions not needed to be exported