first commit on issue-10-2
Update issue-10-2-weekwood.md
完成校对，修改排版
Update issue-10-2-weekwood.md
Update issue-10-2-weekwood.md
Fix quite some issues in 10-2
Merge branch 'issues-10-2-weekwood' of github.com:objccn/articles into issues-10-2-weekwood

Conflicts:
	draft/issue10/issue-10-2-weekwood.md
fix small issues
fix 2 small issue
Delete a strange l
Merge pull request #105 from objccn/issues-10-2-weekwood

Issues 10-2-weekwood