Fix "Programming Computer Vision with Python" link
Remove dead links
Move the `Django` section under `Python`

Django is a high-level Python Web framework, therefore, it should be
included as a subsection of `Python`.

Ref: https://www.djangoproject.com/
Add `Book of Speed` by Stoyan Stefanov
Update free-programming-books.md

scientific python resources
Add Hadoop Illuminated

Adding @hadoop-illuminated to the free book list.
fix link
typo
added french list and 2 books (C, Javascript)
Merge pull request #134 from corburn/master

Fix "Programming Computer Vision with Python" link
Merge pull request #135 from alrra/patch

Minor changes
Merge pull request #136 from jdavis/patch-1

Add Hadoop Illuminated
Merge pull request #137 from mgaitan/patch-1

Scientific python
Merge pull request #140 from revollat/master

added french list and 2 books (C, Javascript)
Update free-programming-books.md

Added Adobe Flex2 programming book
Merge pull request #141 from teu/master

Update free-programming-books.md
Adding Octave
Merge pull request #142 from nerandell/octave

Adding Octave
Put Flask under Python
Merge pull request #144 from nims11/patch-1

Put Flask under Python