included additional Bash resources:   free-programming-books.md
	additional books:   free-programming-books.md
Fixes two typo
	more resources:   free-programming-books.md
	modified:   free-programming-books.md
	modified:   free-programming-books.md
Merge pull request #510 from glenfordwilliams/master

more resources(linux, java, graphics, c++...etc)
Added LaTeX German Reference Book
Added Awk section and book by Bruce Barnett
Merge pull request #511 from unsignedzero/master

Added LaTeX German Reference Book
Sort sections and list
Add MySQL link to the index
Fix link
Merge pull request #512 from Robalni/master

Sort and add MySQL to index
Added new tasks in TODO. Mainly sorting all the free book pages.
Changed permissions on en free books to not have executable
Fixing typo
Merge branch 'master' of github.com:unsignedzero/free-programming-books into unsignedzero-master