Use WebPage in useragent.coffee example.

examples/useragent.coffee

@@ -1,7 +1,8 @@
-if phantom.state.length is 0
-    phantom.state = 'checking'
-    phantom.userAgent = 'SpecialAgent'
-    phantom.open 'http://www.httpuseragent.org'
-else
-    console.log document.getElementById('myagent').innerText
-    phantom.exit()
+page = new WebPage()
+
+page.open 'http://www.httpuseragent.org', (status) ->
+  if status isnt 'success'
+    console.log 'Unable to access network'
+  else
+    console.log page.evaluate -> document.getElementById('myagent').innerText
+  phantom.exit()