Added "DSL Engineering: Designing, Implementing and Using Domain-Specific Languages"
Added "Naked objects"
Added "Methods and Techniques for the Design and Implementation of Domain-Specific Languages"
Added "Prolog Problems"
Added "S-99: Ninety-Nine Scala Problems"
[es] added 3 books of Eugenia Bahit
Add Git Workflows
Merge pull request #625 from Mouseion/patch-gitbook

Add Git Workflows
Merge pull request #623 from alexanderfefelov/master

Added a few books
Merge pull request #624 from esparta/master

[es] added 3 books of Eugenia Bahit
[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