Version: no longer hard-coded in source.
Turn `uglify-js` into a soft dependency.
Removed `postrender`.

If anyone ever used it, it had to be a major performance hog.
More pragmatically, none of the npm public packages which are dependants of zappajs uses it.
partials, layout, coffeecup, zappa.adapter, databag, magic middleware.. clean those up in the reference.
Updates for alternates socket.io, express, and client-side JS packages.