Text Blocks Over Image, Updated

Modernized and improved from https://css-tricks.com/text-blocks-over-image/.

Key Updates

• Positioning the h2 by bottom pins the caption to the bottom of the image.
• Reset bg color declaration on spacer element.
• Switched to http://baconipsum.com/ and http://baconmockup.com for better BEO.
• Semantcized to figure/figcaption markup.