Node support: add package.json.
Node support: add package.json.

Modeled directly off of jquery.json; you can compare the two side-by-side and
see at the bottom the minimal changes and additions.

mcanthony/mailcheck,giovaniharyadi/mailcheck,nacho87/mailcheck,archiveds/mailcheck,archiveds/mailcheck,mailcheck/mailcheck,vladikoff/mailcheck,mcanthony/mailcheck,mcanthony/mailcheck,nacho87/mailcheck,mailcheck/mailcheck,gmac/mailcheck,giovaniharyadi/mailcheck,vladikoff/mailcheck,nacho87/mailcheck,giovaniharyadi/mailcheck,mailcheck/mailcheck,gmac/mailcheck,gmac/mailcheck,archiveds/mailcheck,vladikoff/mailcheck,Shopify/mailcheck