added index for interactive-tutorials-en.md
Add "Developing Games With Ruby"

A free to read online ebook: https://leanpub.com/developing-games-with-ruby/read
Merge pull request #1178 from spajus/patch-1

Add "Developing Games With Ruby"
Update free-podcasts-screencasts-en.md

Alphabetized links based on URL headers, and adjusted [Screencast]/[Podcast] arrangement to be consistent across languages (Screencasts followed by Podcasts).
Merge pull request #1180 from DavidMetcalfe/patch-1

Update free-podcasts-screencasts-en.md
Fixed a ton of dead links, close #1179
added learneroo
added learneroo meta-resource
Merge pull request #1182 from arikrak/master

Added Learneroo for Java and Meta
Added AngularJS with Ruby on Rails
Merge pull request #1172 from todipratik/master

added index for interactive-tutorials-en.md
Merge pull request #1184 from katgironpe/master

Added AngularJS with Ruby on Rails
Add BulletProof Meteor
Merge pull request #1185 from dhamaniasad/patch-3

Add BulletProof Meteor
Update free-programming-books.md

added pdf about openVZ virtualization for gnu/linux
Merge pull request #1186 from oswaldo-O/master

Update free-programming-books.md
[ja] follow-up #1179
Merge pull request #1187 from luminousspice/ja

[ja] follow-up #1179
Add A practical git introduction
Merge pull request #1188 from dhamaniasad/patch-4

Add "A practical git introduction"