Add support for ES6 template functions

[Marcin Ignac]

I've tried to use installify (it's based on detective) with hyperx and it fails at the template string function from this example https://github.com/substack/hyperx:

var vdom = require('virtual-dom')
var hyperx = require('hyperx')
var hx = hyperx(vdom.h)
...
return hx`<div>
    <h1>clicked ${state.times} times</h1>
    <button onclick=${onclick}>click me!</button>
  </div>`

[Renée]

this is fixed in recentish v4 versions. thanks!