* add gulp task seo notifying Google & Bing via their official ping urls
* only run it when --live flag is present
* grab some configs from the Jekyll config file
- new typeface: Europa, loaded from Typekit
- new colors, reduced gray tones
- new hero image
- new gradient overlay
- new buttons
- bigger default font sizes
- ditch caps for action items
* ES6 all the gulp things
* inline critical-path CSS
* bump required node version
* revision assets in staging build too
* update imagemin syntax
* fix sourcemaps being written into production assets