add support for HTMLElement on choo.mount (#597)

* add support for HTMLElement on choo.mount

- removed explicit "string" test and for selector variable, replaced by
"is available and filled" test
- add "if" to separate by incoming "string" or "HTMLElement"

* remove semicolons and white spaces

* add "is in Browser" check for HTMLElement

* add window to HTMLElement

* optimizing "mount" commit

* remove window.HTMLElement check

* change .mount documentation

- add info that selector can be also a DOM element
- remove "nanomount" infos

* add missing line

index.js

@@ -169,15 +169,19 @@ Choo.prototype.start = function () {
 
 Choo.prototype.mount = function mount (selector) {
   assert.equal(typeof window, 'object', 'choo.mount: window was not found. .mount() must be called in a browser, use .toString() if running in Node')
-  assert.equal(typeof selector, 'string', 'choo.mount: selector should be type string')
+  assert.ok(typeof selector === 'string' || typeof selector === 'object', 'choo.mount: selector should be type String or HTMLElement')
 
   var self = this
 
   documentReady(function () {
     var renderTiming = nanotiming('choo.render')
     var newTree = self.start()
+    if (typeof selector === 'string') {
+      self._tree = document.querySelector(selector)
+    } else {
+      self._tree = selector
+    }
 
-    self._tree = document.querySelector(selector)
     assert.ok(self._tree, 'choo.mount: could not query selector: ' + selector)
     assert.equal(self._tree.nodeName, newTree.nodeName, 'choo.mount: The target node <' +
       self._tree.nodeName.toLowerCase() + '> is not the same type as the new node <' +