HTML and CSS upgrade

This pull request upgrades the form.html and message.html to valid HTML 5 based on a starter template I made. You can learn more about it at https://github.com/jcgallaher/website-templates Both messages.html and form.html now have a custom title for your application and blank print friendly style sheet (if you choose to add to it).

Also, I made a number of tweaks, cleanup, edits, and added some additional styles to the form.css file to make the design more fluid and responsive (mobile friendly). All pixel values were replaced with em values to get a pretty close or almost exact measurement to the original design.Vendor prefixes for box shadows and rounded corners were removed since modern browsers now support those style rules. Both pages were tested and everything looks good to go!

I think this is my last pull request for this year and into early next year, (unless there's a mistake I made somewhere, then I'll fix that) since this should get you off to a good start. I had a lot of fun working on this and this certainly helped me to sharpen up my skills again. Have a wonderful holiday and New Years.