Add portuguese list of books to README

Added Tango With Django.

creating a pt_BR version (portuguese from brazil)

Added Andrew Ng's course notes; updated broken link

Ng's materials include problem sets, solutions, handouts/notes, and video lectures.
Fixed broken link for PL/SQL Obsession.

Update free-programming-books.md

Fixed the jQuery index link

Fixed the jQuery index link matching the anchor name.

Added E-Books Directory to Meta-Lists

add some guides to the Rails section in the Russian version, renamed the...

Added two books in Mathematics section

Added SQL Server books from RedGate

fix link for Thinking in C++

Site contains a good deal of free books on a wide variety of subjects.

add some guides to the Rails section in the Russian version, renamed the title of the book about Ruby

I wasn't sure if Advanced Data Analysis belonged in Datamining or Mathematics, but it seems to focus more on the math side of things

Tested and confirmed download links.  A couple require name & email; a few suggest you download other stuff, but you don't have to.  Removed direct PDF link of Mastering SQL Server Profiler in favor of the book's page on RedGate.

Added some of Syncfusion and RedGate free e-books

Books from hackershelf; created Russian list

Added some of RedGate free e-books (SQL Server, .Net, Misc)

I also fixed line with 'mod_perl', because underscore in Markdown
means emphasis and it continues at the rest of the file (at least in
vim).

Added Jeff Erickson's Algorithms Course Materials

2 Mathematica Books added