Added Charities page

Added H3 styling (for simple layout)
Made menu link width based on variables
Added charity images to charities page
Fixed imagemin config

Searches in img/ subdirectories as well now
v0.2.4
Added grunt-svgmin to optimise SVG files
Replaced SVGs with small PNGs
Added Compass plugin to SASS
Fixed invalid CSS
Added sprites directory to watch
Replaced individual charity images with sprite

Resized OFB image
Updated license with new charity image locations