import Peter Zotov's translation

https://gist.github.com/whitequark/6210961
import an English image from Peter Zotov's blog

http://whitequark.org/blog/2013/04/01/ruby-hacking-guide-ch-11-finite-state-lexer/
import the two images for chapter 11 from the original book
convert the syntax of chapter 11

from Markdown to Textile,
the html markups of the original book is also applied.
fit chapter 11 within 80 characters
translate only one untranslated word of chapter 11
Merge pull request #20 from ruby-hacking-guide/ch11

import chapter 11