Add to [Free courses] new courses and sections (#2089)

* 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

free-courses-en.md

@@ -1,6 +1,6 @@
 ### Index
 
-* [Algorithmic](#algorithms)
+* [Algorithms & Data Structures](#algorithms--data-structures)
 * [Android](#android)
 * [AngularJS](#angularjs)
 * [Assembly](#assembly)
@@ -9,6 +9,7 @@
 * [C#](#c-sharp)
 * [C++](#c-2)
 * [Clojure](#clojure)
+* [Compilers](#compilers)
 * [CUDA](#cuda)
 * [Databases](#databases)
 * [Git](#git)
@@ -29,12 +30,15 @@
 * [Ruby](#ruby)
 * [Sails.js](#sailsjs)
 * [Scala](#scala)
+* [Software Engineering](#software-engineering)
 * [Swift](#swift)
+* [Theory](#theory)
 * [Web Development](#web-development)
 
 
-### Algorithms
+### Algorithms & Data Structures
 
+* [Berkeley University CS 61B: Data Structures](http://datastructur.es/sp16/)
 * [Stanford University Algorithms: Design and Analysis, Part 1](http://online.stanford.edu/course/algorithms-design-and-analysis-part-1)
 * [Stanford University Algorithms:Algorithms: Design and Analysis, Part 2](http://online.stanford.edu/course/algorithms-design-and-analysis-part-2)
 
@@ -89,6 +93,11 @@
 * [Functional Programming with Clojure](http://mooc.fi/courses/2014/clojure/index.html)
 
 
+### Compilers
+
+* [Stanford's Compilers](https://lagunita.stanford.edu/courses/Engineering/Compilers/Fall2014/about)
+
+
 ### Cuda
 
 * [Intro to Parallel Programming Using CUDA to Harness the Power of GPUs](https://www.udacity.com/course/intro-to-parallel-programming--cs344)
@@ -174,6 +183,8 @@
 * [Berkeley's Math 10B: Methods of Mathematics: Calculus, Statistics, and Combinatorics](https://www.youtube.com/view_play_list?p=-XXv-cvA_iCZ8sTG0pDuBubsDfOFoY2X)
 * [Bits: The Computer Science of Digital Information](http://www.extension.harvard.edu/open-learning-initiative/bits)
 * [Computer Graphics](http://nptel.ac.in/courses/106106090/)
+* [LouvainX Paradigms of Computer Programming – Abstraction and Concurrency](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-2x-1#!)
+* [LouvainX Paradigms of Computer Programming – Fundamentals ](https://www.edx.org/course/paradigms-computer-programming-louvainx-louv1-1x-1)
 * [MIT Numerical Methods (2014)](http://www.iitg.ernet.in/kartha/CE601-14/CourseSchedule.htm)
 * [MIT's Artificial Intelligence](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-034-artificial-intelligence-fall-2010/)
 * [MIT's Computer Language Engineering](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-035-computer-language-engineering-sma-5502-fall-2005/lecture-notes/)
@@ -232,11 +243,25 @@
 * [Principles of Reactive Programming](https://www.coursera.org/course/reactive)
 
 
+### Software Engineering
+
+* [Advanced Software Construction in Java](https://www.edx.org/course/advanced-software-construction-java-mitx-6-005-2x#!)
+* [Agile Development Using Ruby on Rails - Advanced](https://www.edx.org/course/agile-development-using-ruby-rails-uc-berkeleyx-cs169-2x#!)
+* [Agile Development Using Ruby on Rails - Basics](https://www.edx.org/course/agile-development-using-ruby-rails-uc-berkeleyx-cs169-1x#!)
+* [Software Construction in Java](https://www.edx.org/course/software-construction-java-mitx-6-005-1x)
+
+
 ### Swift
 
 * [Swiftris - Build an iOS Tetris app from scratch](https://www.bloc.io/swiftris-build-your-first-ios-game-with-swift)
 
 
+### Theory
+
+* [Automata Theory](https://lagunita.stanford.edu/courses/course-v1:ComputerScience+Automata+Fall2016/about)
+* [Udacity: Intro to Theoretical Computer Science](https://www.udacity.com/course/intro-to-theoretical-computer-science--cs313)
+
+
 ### Web Development
 
 * [Discover Flask - Full Stack Web Development with Flask](https://github.com/realpython/discover-flask)

free-programming-books.md

@@ -266,6 +266,7 @@
 * [Clever Algorithms](http://www.cleveralgorithms.com/nature-inspired/)
 * [CS Unplugged: Computer Science without a computer](http://csunplugged.org/books/)
 * [Data Structures](http://www.cse.iitd.ernet.in/~suban/cs130/index.html) - Prof. Subhashis Banerjee, IIT Delhi
+* [Data Structures (Into Java) - Paul N. Hilfinger](http://www-inst.eecs.berkeley.edu/~cs61b/fa14/book2/data-structures.pdf) (PDF)
 * [Data Structures and Algorithms: Annotated Reference with Examples](http://dotnetslackers.com/projects/Data-Structures-And-Algorithms/) - G. Barnett and L. Del Tongo
 * [Data Structures Succinctly Part 1, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/datastructurespart1) (PDF, Kindle) *(Just fill the fields with any values)*
 * [Data Structures Succinctly Part 2, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/datastructurespart2) (PDF, Kindle) *(Just fill the fields with any values)*