Addition of DIN99o color space
README.md: DIN99o added,  additional reference
README.md: fixed broken line, added collordiff_din99
DIN99o completed
removed din99otest.jl
colorspaces.jl: typalias added
Merge branch 'master' into colorspaces

DIN99o implementation
Removed double typealias line.
Merge pull request #27 from m-lohmann/colorspaces

Implementation of DIN99o color space