vhf/free-programming-books — pull request #1197 by switchhax (2014-11-16 19:12:26+00:00)
Title: Created 'problem-sets-en.md'    for reference: #1191

Mainly its the base we all could (and in my opinion should) build on. It´s all i found this weekend, you might not agree with the title, but i think the rest is ok.
(#1191 could be closed after a merge)