Upgrade html5 to 1.0.5

 * Needed for https://gerrit.wikimedia.org/r/#/c/153191/

 * Installed with `npm install html5 --no-optional` to remove jsdom

 * Also, upgrades html5-entities to 1.0.0

 * Fixes an npm complaint about the version of async that handlebars
   wants.

Change-Id: I593d1922d5a095d469273a81b4b2d31de1aa414a