Added sky theme for reference
New swc_slides theme based on sky
Call swc_slides theme, remove bootstrap
Added theme files to required files for EXTRAS target (?)
Added bootstrap styles
Removed reference to "sky" theme
Removing Open Sans font
Removing box and shadow around images
Making navigation arrow colour into a variation on Software Carpentry blue
Tiny wording fix.
Merge pull request #14 from amyrbrown/slides_css

Made slides more SWCish