Merge pull request #944 from esparta/master

[en] Sorting some sections on english books
[es] Added Database book
25,000 stars
add think python

think pythonとはAllen Downey氏が書いているthinkシリーズの１つである．
他のThinkシリーズは[こちら](http://greenteapress.com/)からご覧になれます．
Merge branch 'master' of https://github.com/vhf/free-programming-books
Merge pull request #946 from SamuraiT/master

add thnk python
Move Awk book from Unix section to Awk section.
Awk book -> Awk section (from Unix)

Move Awk book from Unix section to Awk section and remove typo extra line.
Merge pull request #951 from hoganlong/master

Move Awk book from Unix section to Awk section.
Add four base Java courses to free-courses-en.md

Includes 
* MIT OpenCourseWare introduction to Java
* Udacity Problem Solving With Java
* Coursera Princeton Algorithms Part I 
* Coursera Princeton Algorithms Part II
Add Central Connecticut State University Course

Intro to CS Using Java
Merge pull request #952 from esparta/master

[en] Sorting Java Section
Merge pull request #953 from mananshah99/patch-1

Add four base Java courses to free-courses-en.md
Added Cornell's fp course
Merge pull request #954 from jsyeo/cornell-fp

Add Cornell's functional programming course
Add berkeley's sicp in python course
Merge pull request #955 from jsyeo/berkeley-sicp

Add berkeley's sicp in python course
Fix markdown
Merge pull request #956 from DavidePastore/patch-1

Fix markdown
Add additional JS and iOS courses