Made the background-image cover the full height of the page

To make this work, there needs to be a 100% height property applied
to the parent element. Which in this case was the html element.
Added .map file to .gitignore list

.map files are now generated by Sass since 3.3. The map file is what
maps all of the compiled CSS back to the source Sass declarations:
http://thesassway.com/intermediate/using-source-maps-with-sass
Merge branch 'gh-pages' of https://github.com/shanecarmody/designbypie into gh-pages