Task Description

Add 5 Code Examples to the Winxed Tutorials

Steps To Complete This Task

Create a fork of Rosella on github.com
You will be modifying files in the gh-pages branch, which are automatically updated at after each push to Github.
This task requires adding 5 full code examples to the Winxed tutorial. These will be standalone Winxed programs or functions that perform the following tasks:

Write a function to return the N-th Lucas number via the recursive formula [IMAGE http://upload.wikimedia.org/wikipedia/en/math/5/1/4/514b9e3f49107f32927a3e3cdd3cfb4c.png]
Write a function to return the N-th Lucas number via the closed-form [IMAGE http://upload.wikimedia.org/wikipedia/en/math/3/3/c/33cddd2286020ccc8d1181a4da4e91f2.png]
Write a function that, given two real numbers R0 and R1, returns a function that calculates the N-th number in the sequence f_0 = R_0, f_1 = R_1, f_n = f_(n-1) + f_(n-2) . This is sometimes called a "generalized Fibonacci sequence".
Write a function that, given two real numbers a and b, determines if the complex number a + b*i is a Gaussian Prime.
Write a function that looks for string1 inside string2, allowing for only a single incorrect letter. If the string exists exactly or with at most one incorrect letter, return 1, otherwise return 0.

Create a Github pull request (button on the upper right of your fork) to have your changes incorporated into the master repository

Giving more examples Winxed will make it easier for people to learn the language.