Add social sharing images

[mattstratton]

Should add to frontmatter for where the image is.

See if we can make a gulp task to auto-build them if they aren't there.

[mattstratton]

These images should either be named in a specific way, or put in a certain directory so they can be excluded from the gulp processing.

[mattstratton]

OK, this totally works now.

Check it out:

[bridgetkromhout]

Fancy!

[bridgetkromhout]

This looks cool. I'm unsure what if anything remains on it, and if anything like an autobuild task is needed, does this need to be in v1.0?

[mattstratton]

Autobuild is a huge add, so not for v1. It's already documented in the readme. Closing this one.