Merge pull request #18 from anthonyhan/gh-pages

fix some typos in ch5,6,7
remove unused figures and optimize remains
Merge remote-tracking branch 'origin/gh-pages' into gh-pages

* origin/gh-pages:
  refix
  using markdown syntax
  fix some typo
  fixed some typo
  code correction
  word correction
start chapter 11
move to 11.1.1
chapter 10 done
add contributing guides
little fix
little fix
forgot to exclude the contributing guides file
modified according to your suggestion
nearly finish 11.1.1
nearly finish 11.1.1
little fix
add sample pdf
add taobao link
11.1.4 half way
finished section 11.1
fix typo, close #20
Merge pull request #19 from dotcom900825/gh-pages

Start translating chapter 11