Custom Element rewrite (#864)

* new custom element impl

* use new dom() pragma

* small wrapper for dom node widget

* any some returns

* return event properties

* add support for global theme

* add test for global theme

* assert descriptor error

* update tests

* cover checking a property of a child

* package-lock incorrect

* rename dojo global to dojoce to avoid potential conflict with dojo1

* correct event detail

* make on properties prefixed to avoid event handler conflicts on dom nodes

* use web components polyfills

* bump safari version on mac

* add child types, skip suite on browsers that fail custom elements even with polyfill

* text node test

* fix erroneous package-lock conflicts

intern.json

@@ -32,7 +32,13 @@
 					}
 				}
 			}
-		}
+		},
+		"plugins": [
+			{
+				"script": "./tests/support/loadCustomElements.js",
+				"useLoader": true
+			}
+		]
 	},
 	"node" : {
 		"plugins": [
@@ -62,7 +68,7 @@
 				{ "browserName": "internet explorer", "version": "11" },
 				{ "browserName": "chrome", "platform": "WINDOWS" },
 				{ "browserName": "firefox", "os": "WINDOWS", "os_version": "10" },
-				{ "browserName": "safari", "version": "9.1", "platform": "MAC" },
+				{ "browserName": "safari", "version": "10", "platform": "MAC" },
 				{ "browserName": "iPhone", "version": "9.1" }
 			]
 		},

package.json

@@ -43,7 +43,7 @@
     "@types/selenium-webdriver": "^3.0.8",
     "@types/sinon": "~4.1.2",
     "@types/yargs": "^8.0.2",
-    "@webcomponents/custom-elements": "^v1.0.0-rc.3",
+    "@webcomponents/webcomponentsjs": "1.1.0",
     "bootstrap": "^3.3.7",
     "chromedriver": "2.33.2",
     "codecov.io": "0.1.6",