make example py2 compatible

Author: spyoungtech

examples/selenium-requests/features/steps/selenium_steps.py

@@ -1,4 +1,8 @@
-from urllib.parse import urljoin
+try:
+    from urllib.parse import urljoin
+except ImportError:
+    from urlparse import urljoin
+
 from behave import *
 from behave_webdriver.steps import *
 
@@ -16,4 +20,4 @@ def send_request_page(context, method, page):
 
 @then('I expect the response text contains "{text}"')
 def check_response_text_contains(context, text):
-    assert text in context.response.text
+    assert text in context.response.text