Rename an example test

Author: mdmintz

examples/proxy_bing_test.py renamed to examples/get_ip_with_bing.py

@@ -4,7 +4,7 @@
 
 class MyTestClass(BaseCase):
 
-    def test_proxy_on_bing(self):
+    def test_get_ip_address_with_bing(self):
         self.open('https://www.bing.com/search?q=what+is+my+ip')
         ip_address = self.get_text("#b_results li.b_top")
         print("\n\n%s\n" % ip_address)