surf output image smaller than standard (or specified) figure size in IJulia and doesn't subplot properly

The output of surf seems very undersized in IJulia, and cannot be increased by using `figure(figsize=(20,20))`

Also, surf doesn't map to subplots correctly (see 2nd example below)

```
using PyPlot

u = range(0.0,stop=2pi,length=300);
v = range(0.0,stop=pi,length=300);

lu = length(u);
lv = length(v);

x = zeros(lu,lv);
y = zeros(lu,lv);
z = zeros(lu,lv);

for uu=1:lu
for vv=1:lv
x[uu,vv]= cos(u[uu])*sin(v[vv]);
y[uu,vv]= sin(u[uu])*sin(v[vv]);
z[uu,vv]= cos(v[vv]);
end
end

colors = rand(lu,lv,3)

figure(figsize=(20,20))
surf(x,y,z,facecolors=colors);
```

```
using PyPlot
x = -5:0.25:5
y = (-5:0.5:5)'
x2 = repeat(x,1,length(y))
y2 = repeat(y,length(x),1)
z = sin.(sqrt.(x2.^2 .+ y2.^2))

subplot(2,1,1)
surf(x2,y2,z)

subplot(2,1,2)
surf(x2,y2,z)
```