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* Added three great R books

* Fixed entries

removed the potentially not free book, and alphabetized entries

* Update free-programming-books.md

Added I love ruby official website so that people can get latest updated book every time. This was done because I consider dropbox as a spyware and so have moved to openmailbox for my book distribution.

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* Added Using Zend Framework 3 book

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Added SICP in Python

* deleted two spaces

* fix ordering

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* add ESP8266 section and a book to it

* fix link case

* update url and add author for "High Performance Browser Networking"

* placate travis

Via official tweet https://twitter.com/Raspberry_Pi/status/786526873396342784

* Add HTML version of "Using Swift with Cocoa and Objective-C"

* Correct the syntax of Swift links with multiple formats

Fixed alphabetic order

ObeytheTestingGoat.com is the author's website for the book. I think the presentation is nicer than O'Reilly site

* Add Unix as IDE repo (epub & mobi format)

* Reorder alphabetically

* Add Berkeley's CS61 Data Structures free course

* Add LouvainX courses on Computer programming paradigms

* Add MIT's Software construction in Java course

* Add Advanced Software Construction course

* Change Algorithmic to Algorithms and Data Structures

* Add software engineering section with 4 courses

* Fix to alphabetically order courses

* Add computer science theory section

* Add theory section to index

* Add compilers section with course

* Fix spacing for Theory courses

* Fix alphabetical ordering

* Add Data Structures PDF by Paul Hilfinger from Berkeley

Modern authoritative guidelines for writing C++ code (the initial primary authors and maintainers are Bjarne Stroustrup and Herb Sutter and the guidelines so far were developed with contributions from experts at CERN, Microsoft, Morgan Stanley, and several other organizations).

I's an epub version of the site, the author himself links to it

This addresses issue #2058.

Per the Online Book Page at U Penn, BSTJ is presumed to be out of copyright: "The Bell System Technical Journal published its first issue in 1922. No copyright renewals are known to exist for issues of this journal. In 1984, after the breakup of the Bell System, The Bell System Technical Journal was renamed, and its current version is known as the Bell Labs Technical Journal."