Calling all $(".turtle")s!

Goals:

$ is an alias for the jQuery function.
jQuery (i.e., $) returns all HTML elements meeting a search criterion, such as the <body> element or all elements with class type 'turtle'.
Use the object returned by jQuery to simultaneously manipulate all elements referenced in the collection.
Access individual elements in a jQuery collection using a for x in loop. Make the element behave like a sprite by wrapping it in a new jQuery object.

In the previous lesson, we used the jQuery function with id-selector syntax. The examples above illustrate how to select all elements of a specific type or class, using element-selector syntax and class-selector syntax, respectively. The former states the element type as a string (e.g., $("body") ) and the latter is a string containing the class name prepended by a period (e.g., $(".turtle") )

jQuery returns HTML elements in a jQuery wrapper object, which you can subsequently control using familiar Pencil Code functions. When jQuery returns a collection of HTML elements, that object behaves much like a collective sprite. But when accessing individual elements in a jQuery collection, that element must be wrapped in its own jQuery object before it can be manipulated as a sprite!

Save each of the following in a folder called Selectors.

NoMoreDot2000: Use jQuery CSS element selector syntax to gain access to the HTML <body> element. Then use the css method to set the backgroundColor property.
SetTheScene: Instead of setting a color, decorate your background using an image. Set the <body> element's background-image property to a string that identfies the image's URL, e.g.,
```
"url('https://www.pngall.com/wp-content/uploads/2016/07/Space-PNG-HD.png')"
```
TeamTurtlesTwo: Create a new version of TeamTurtles with 50 sprites that you control with a single jQuery reference.
AlphabetSoup: Write a script that positions letters in a message randomly about the screen. Rather than create an id property for each label, use $ to access all the label elements. Iterate through this collection to unscramble the message, one letter at a time.