Change blink time to four seconds

[tonychacon]

This PR replaces #2 as a rebased branch instead.

• Write the code
• Write all the tests
• Document the code

[tonychacon]

Perhaps we should try somthing like:

for(int i=0 ; i < 5 ; i++)
{
   System.out.println("i is : " + i);
}

[stoneyzjw]

it's so good