Tidying things up.

[EatonCiaran]

• Fix inconsistent use of single and double quotes. Now favours double quotes.
• Fix inconsistent space and tab indenting, and remove trailing whitespaces. Now 4 space indent.
• Removed unneeded semicolons on function declarations and for loops
• Fix some typos, clarify some comments/messages, more consistent casing
• Fix invalid HTML (lack of title element) and made it HTML 5.
• Rename license file to standard convention
• Remove custom equalTo function and instead use deepEqual for better error messages when type mismatch.
• Make answer prompts more consistent i.e. some hinted for a string, only 1 really needs that
• Flesh out README
• Other general Prettier changes e.g. typeof not needing brackets; add trailing commas to objects and arrays; spaces before brackets, after commas, and between operators.