Chapter1 java code
add ruby version code for chapter 02
Merge branch 'master' of https://github.com/julycoding/The-Art-Of-Programming-By-July
ruby version for chapter 03
Merge pull request #128 from RONGHAI/master

ruby version for chapter 02 & 03
improve chapter 27 readability
fix chapter 27 hyperlink
Update about in Readme.md
Add reference for binary_search from Peter Norvig
java code for chapter1 & 2
Merge branch 'master' of https://github.com/schemacs/The-Art-Of-Programming-By-July
adding java code for chapter1 & 2