* Uniform treatment of Leanpub books

free Leanpub books come in two flavors
- free to read online without an account or email address
- free to read after a "purchase" with a minimum price of "Free!" A
valid email is requested to create an account, but you can read   or
download even if the email is bogus.

After some consideration, I'm proposing that the free-to-read books
should be without any annotation, and the free-after-"purchase" books
be denoted as *(Leanpub Account or valid email requested)* . This PR
implements that for the english lists.

Comments requested!

* add required space

Book is not free. It's a minimum of $4 https://leanpub.com/whatsnewinjava8 .

Added reviewed books compiled from from StackOverflow documentation

* For people looking at the file listing for the English list. (This redirect may eventually swap contents with the primary /free-programming-books.md to put English on an equal footing with the other languages.)

* Link fixed. Comment added.

* Please add Django 2.0 Online Book

I would like to add this online book of Django 2.0 to the list.

Thanks in advance.

* Django 2.0 Tutorial for Beginners

Removed slash "/" at the end of link.
(Although several other links contain it)

Added some great free Portuguese screen-casts courses which I've used in past and some Brazilians have been using.

* Added JavaScript/Redux 

1. Added new section to JavaScript (Redux) 
2. Add the "The Complete Redux Book" to the list

* add required spaces, add account required notation

* Please add a new Python Book

I found this new book just released in January 2018.
It is a compilation from StackOverflow documentation and is freely available.

Thanks.

* Please add new Python book

Changes made.

* nit

* add new Podcasts

* alphabetical order

* Add some Vietnamese courses.

* Update free-courses-vi.md

* Add GLib/GTK+ Development Platform book.

The books is licensed under a Creative Commons Attribution-ShareAlike 4.0
International License:
https://creativecommons.org/licenses/by-sa/4.0/

* Put link in order.

* Add pdf indicator.

"Java: A Beginner's Guide" is just the first chapter of a book
"NIO Framework" is a 6 page paper, also not a book

It pointed to a tutorial and not to the book.

remove the link to "Operating Systems Concept 9th edition" because it is not a book, but a bunch of slides (#2674)

* Update free-courses-en.md

Added a Python online resource under the Python course section.

* Update free-programming-books.md

Added techbeamers to meta-list section.

* Add Foundation of Data Structures to free-courses list

* Add Foundation of Data Structures to free-courses list

* Add Foundation of Data Structures to free-courses list with correct number of blank lines

* fixed link

* remove trailing slash to satisfy linter

* Update free-programming-books-ru.md

Added authors names, link to Stolyarov's "Programming Intro"

* Update free-programming-books-ru.md

Alphabetization

* Update free-programming-books-tr.md

* Update free-programming-books-tr.md

Updated in alphabetical order

* Update free-programming-books-tr.md

added authors

* Update free-programming-books-tr.md

* Koma-Script

* add space to satisfy linter

* another space to satisfy linter

* Added Microservice Databases: Migrating from Relational Monolith to Distributed Data (By O'Reilly)

* fixed concerns

* Added the bash book to the books section

I have attempted to add the bash book to the book section again. There was  an issue the last time , i tried to propose the file change as i had not placed it in alphabetical order. Someone please review this :)

* fixed alphabetization

* Add couple of book for PHPUnit

* Added PDF text to the links

* Added PHPUnit Best Practices

* Alphabetically arranged

resources suggested by @kareUdon

* Add list of courses in Spanish.

* Update readme to add list of courses in Spanish.

* Correct titles in the list.

* Update free-programming-books-es.

Update, add and clean links. add books, add authors and correct types of
documents. Delete paid links or broken.

* Correct cli errors.

* Correct Cli Errors - 2

* Fix alphabetical ordering.

* Fix alphabetical order and a some link and angle bracket.

free-courses-es.md: Correction of links and anchors.
free-programming-books-es.md: Alphabetical ordering.

* Fix 2635#pullrequestreview-76815495

@eshellman If I finish with updating the documents in Spanish  #2635
before Black Friday.
You could give me a new pc for me work?   👅 Of Christmas
🎁...  🤐 🤐       Ok, joke..
sorry.

I m going to work 💪  ☺ I need to do it, to feel satisfied
with myself 😎

* [JavaScript and Node FUNdamentals](https://web.archive.org/web/20150327025334/https://leanpub.com/jsfun/read) - Azat Mardanov is not a free programming book

* implement #2357

* misc cleanup