Updated theme tags
Updated Screenshot
$grunt watch now actually works for the CSS files
Removed unneeded declaration
Simplified author template code, added backwards compatibilty for < WP 3.7 to extras.php
Updated comment with clearer description
Updated grunt-autoprefixer to 0.6.0.
Moved built css files into their own folder
Added author to package.json (that's me!)
Just in case a non-css file sneaks in the css folder, the task won't fail
Put the minified CSS files where they belong
Added overflow-wrap to future proof things a bit

See note: https://developer.mozilla.org/en-US/docs/Web/CSS/word-wrap
Removed id="primary" from widget area to avoid duplicate IDs
Removed duplicate or invalid IDs
Improved HTML 5 compliance
Self closed <image> tags
Fixed HTML 5 validation issues here too
Attempting to find middle ground between syntax errors here.
Switched from <ul> tags for Social links to a div tag. Again, for validation
Improved performance by loading decode scripts with sidebar in the footer