Remove two duplicates
Update free-programming-books.md

fix typo
Merge pull request #1165 from chimeno/patch-1

Update free-programming-books.md
Merge pull request #1164 from jochenvdv/remove-duplicate

Remove two duplicates
30,000
included vim section in index
Added android screencast
Merge pull request #1166 from todipratik/master

included vim section in index and android screencast added
Update free-programming-books-es.md

libro sobre Debian GNU/Linux para administradores
Merge pull request #1167 from oswaldo-O/patch-1

Update free-programming-books-es.md
Update free-programming-books.md
Merge pull request #1168 from HashanP/patch-1

Update free-programming-books.md
Update free-programming-books.md
Merge pull request #1169 from xmonader/patch-1

Update free-programming-books.md
Fixed formatting
Added Understanding Linux Kernel

Added understanding linux kernel pdf to the free-programming-books.md
Added a book on Meteor
Merge pull request #1171 from AndreiCurelaru/master

Added a book on Meteor
Merge pull request #1170 from vjananth89/master

Added Understanding Linux Kernel
added index for interactive-tutorials-en.md