* 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."

* Added a new book

* Updated incorrect name

No idea how that got changed in earlier commit

addresses issue #2045

* Update free-programming-books.md

add How to Code in HTML5 and CSS3

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

Add EPUB, PDF, MOBI for Elixir's Getting Started tutorial

Grouped Symfony books like other frameworks and updated versions per contribution guide.

The official [Self language](http://www.selflanguage.org/) documentation.

IoT section added and IoT in five days (free software licensed) book link added for PDF EPUB (#1997)

* Added IoT section and aded IoT in five days books

* Formatting issue

* Anchor link issues

* Header spacing corrected for travis-build issue

Added Dayle Rees's Laravel: Code Smart book to the PHP list.

* Added IRPF90 gitbook to Misc section

* Update free-programming-books.md