Merge pull request #17 from ialja/master

Node.js readme updated
Added advanced example
Introduction to JSON
Merge pull request #18 from sparkica/master

Updated old examples and added JSON intro
Updated readme
Merge pull request #19 from sparkica/master

Updated readme
README or not
added my presentation
Merge pull request #20 from mrfoto/patch-1

README or not
Merge pull request #21 from mrfoto/patch-2

added my presentation
Added presentations for next week