Figure 1.10 is broken

[tjunnone]

Figure 1.10 is broken on the web. The url is:
http://natureofcode.com/book/chapter-1-vectors/imgs/chapter01/ch01_10.png

while it should be:
http://natureofcode.com/book/imgs/chapter01/ch01_10.png

[shiffman]

dup of #284