Remove unused module from form validator exercise

The aui-button module was not used, because the submit and reset buttons
were created using the <button> tag. This example works without loading
this module, so it was removed.
Remove unused variable from 06-registration-form.html
Reordering code in <script> to follow structure of form more logically

In the README directions, this exercise will be developed component by
component, so it make sense to have the javascript in the order the
components are introduced to the registration form
Source Formatting: Added in line breaks for aui modules

Goes against AlloyUI style guidelines, but make shte code more readable
since there are so many modules loaded in this example.
Removed unused attribute "fieldStrings" from form 2 validator

Since a rangeLength is specified for the textarea in this form, the
message in fieldStrings is overriden by a prompt that says "Please enter a
value between 1 and 160 characters long".
Removed console.log statement

This exercise still functions without this attribute, and it is more
confusing to explain why it is included than to remove it.
Source formatting -- switched char counter and image cropper

Changed the order that these components would be added in for the
README.md description of writing this file, so it made sense to switch
their order in this file. Both the information in the <body> section and
inside of the <script> tags was changed.
Char counter is no longer saved as a variable

The variable charCounter was never used, and the char counter is still
functional without it, so it was removed
Added README.md for 02-components

This file contains step by step directions for exercises in this folder