enhancement/1 json carousel

[tyler-vs]

• Add instructions for running example locally
• Update HTML content
• Update script
• Update script comments
• Move carousel initialization to index.html
• Add jsdocs to methods
• Return if no value was passed for parameter
• Update carousel empty element with more data- attributes for features
• Add auto controls feature check
• Add renderAutoControls method
• Remove commented out code
• Replace renderButtons with renderAutoControls
• Uncomment fade related code in the JSON slider's constructor
• Update styles with button and fade support
• Remove unnecessary code
• Update placeholder div element with data- attributes
• Add support for captions
• Add support for pager
• Add event listeners for "slide to" buttons
• Fix left/prev button styles
• Add inspiration section
• Move slides variables
• Add errors.js
• Include errors.js to example
• Throw custom error if no selector
• Replace x with this.slides
• Remove x variable
• Change new of showDivs method to showSlide