Merge pull request #2 from vhf/master

sync with vhf:master
Merge pull request #1093 from akshaymohite/master

Removed a link from Ruby resource
Add MATLAB Succintly book.
28000
Merge pull request #3 from vhf/master

sync with vhf:master
coquille
Merge pull request #1095 from maieul/master

coquille
Merge pull request #1094 from levibostian/matlab-succinctly

Add MATLAB Succintly book.
Alphabetize entries in free-programming-books (en)
Merge pull request #4 from vhf/master

sync with vhf:master
Added Markdown & reStructuredText in -zh.md
Merge branch 'master' of https://github.com/sunxb10/free-programming-books
fixed formatting
Merge pull request #1096 from seewes/master

Alphabetize entries in free-programming-books (en)
Add Elementary Algorithms book
fix link nodetuts.com
Merge pull request #1099 from NgaNguyenDuy/master

fix link nodetuts.com
Merge pull request #1100 from JIghtuse/master

Add Elementary Algorithms book
Dart added
delete a duplicated book