* Added Portuguese and Italian Translations.
Added Portuguese and Italian Translations of the book Python For Everybody by Dr. Charles Russell Severance
* Update free-programming-books.md
Updated the link to the latest edition.
* Update free-programming-books.md
Updated edition for the book with author and links in three places.
* Update free-programming-books.md
Added Think DSP - Digital Signal Processing in Python.
* Update free-programming-books.md
Added Think Data Structures: Algorithms and Information Retrieval in Java.
* Update free-programming-books.md
Added two new books;
Think C++: How To Think Like a Computer Scientist
Modeling and Simulation in Python
* Minor changes to adhere to Contributing.md
Thanks to @kashirash
Suggested edits to pass travis-ci and respecting markdown formatting.