Rename a folder

Renamed folder from Advanced operations to Iteration Operations
Working with Arrays

Added Array Iteration Operations basics
Added JSON Examples

Added JSON Sample objects
Added some class definitions

Added JS class definitions, inheritance, singleton sample, etc.
Added some debugging options and explanations

Added debugging options and explanations
Added modules samples

Samples about how to export, and group modules in Node
Event Emitters samples

Samples about how to write event emitters and how to handle events
emitted by these classes.
I/O operation samples

Samples of Input Output operations related with files and directories.