Can I install 11 speed cassette on 10 speed hub by skipping last cog?
Shimano road 11 speed freehub bodies are not simply 1 sprocket wider than a 10 speed freehub body. 

The 11 speed body is just 1.8mm wider than the 10 speed body, 11 speed sprocket spacing is less than 10 speed to fit the extra sprocket in (and I'm guessing there there may be a little more overhang of the freehub body flange).

You cannot remove the biggest sprocket as is it affixed to a spider. You might be able to get away with removing the smallest sprocket, if you can find a spacer of the right thickness to take up the extra space this leaves.