jQuery TypeByLetter: Make string of text appear letter by letter

/*

 JQuery TypeByLetter Plugin
 Version 2.0.1
 source : /TypeByLetter.plugin.js
 dependency: jQuery


 TypeByLetter is a JQuery plugin for simulating a "typing effect" on an element.
 It supports using text already in the element, or through its {content} option.

 Current Available Options:
    {speed} - (int) Sets the time break in milliseconds between letters being written to the element. DEFAULT: 100
    {content} - (plain text -or- JQuery .text()) Specifies the text that will be written to the specified element. This can be a JQuery selector such as: $('p#text').text(). DEFAULT: $(this).text()
    {append} - (bool) Specifies whether the text appends to the element (true), or if it erases the elements html before writing (false). DEFAULT: false
    {callback} - (function) Function to be run once the typing is done.
*/