Move ffi into a seperate crate.#26

Merged

jdroenner merged 2 commits intogeorust:masterfrom jdroenner:gdal-sys2

Jan 2, 2017

+81-54

Commits on Dec 18, 2016

- moved ffi to a new crate: gdal-sys.
jdroenner
committed

Commits on Dec 23, 2016

Removed "use gdal_sys::gdal;" and "use gdal_sys::ogr;" from module. Both are now directly included where needed.
jdroenner
committed