fixes #961
Merge branch 'master' of github.com:vhf/free-programming-books
Merge branch 'master' of github.com:vhf/free-programming-books
Merge branch 'master' of github.com:vhf/free-programming-books
Alphabetizing and following Contributing.md
@hanleilei tnx - #950 - [zh] - Perl init