Use http link instead of ftp

The ftp:// protocol is not recognized as a link.
Merge pull request #870 from edwlook/patch-1

Use http link instead of ftp
Ruby on Rails 3.2 für Ein-, Um- und Quereinsteiger
Ruby on Rails 3.2 - Step by Step
Ruby on Rails 4.0 Guide
Remove duplicate entry
Merge pull request #871 from danielbayerlein/ruby-on-rails

Ruby on Rails
added Elasticsearch: The Definitive Guide
Merge pull request #872 from franck09/master

added Elasticsearch: The Definitive Guide
22,000 Stars
Projeto de Algoritmos em C
Merge pull request #873 from viniciusmo/master

Projeto de Algoritmos em C
Unicamp curso C
Added "Introducing Microsoft SQL Server 2014"

Added link to "Introducing Microsoft SQL Server 2014". http://blogs.msdn.com/b/microsoft_press/archive/2014/04/02/free-ebook-introducing-microsoft-sql-server-2014.aspx
Removendo link
Merge pull request #875 from viniciusmo/master

Introdução ao Curso de C  - Unicamp
Merge pull request #874 from DaniSQL/patch-1

Added "Introducing Microsoft SQL Server 2014"
Power Programming with Mathematica - #876
23,000
Create free-programming-books-ro.md"