[es] Adding node.js to the list.
Merge pull request #626 from matysanchez/master

[es] Adding node.js to the list.
Add bunch of interactive tutorials
Add githug tutorial (in the shell)
Add Learn Linux The Hard Way guide
Merge pull request #627 from JIghtuse/master

Add more interactive tutorials and guide on Linux
[es] minimal fix & secondary link (a PDF) to 'Python para principantes'
Added "tetrix in Scala" (EN, JA)
Added "Программирование на Эрланге"
Added "Developing Web Applications with Haskell and Yesod" (RU)
Alphabetized Haskell section
Added "Exploring Generic Haskell"
Added "Reactive Objects and Functional Programming"
Add TCP/IP book
Add e-maxx.ru book
Add C/C++ book
Add system administration UNIX book
little changes
Merge pull request #628 from alexanderfefelov/master

Added "tetrix in Scala" (EN, JA)
Merge pull request #629 from SuperStas/some-ru-books

[ru] Added a few books