Graphic properties not working

[Marco Caliari]

Dear maintainers,

I noticed that some (all?) graphic properties do not work anymore in 
Octave 3.1.54

octave:1> contourf(peaks,'EdgeColor','blue')
error: set: unknown property "EdgeColor"
error: called from:
error:   /usr/local/share/octave/3.1.54/m/plot/__contour__.m at line 191, column 5
error:   /usr/local/share/octave/3.1.54/m/plot/contourf.m at line 71, column 5

I don't know if it is a bug or a syntax change.

Best regards,

Marco