unittest.TestCase.assertTrue insted of assert <condition> (#101)

since we use unittet.

source/page-objects.rst

@@ -44,13 +44,13 @@ where the page objects will be defined.
           #Load the main page. In this case the home page of Python.org.
           main_page = page.MainPage(self.driver)
           #Checks if the word "Python" is in title
-          assert main_page.is_title_matches(), "python.org title doesn't match."
+	  self.assertTrue(main_page.is_title_matches(), "python.org title doesn't match.")
           #Sets the text of search textbox to "pycon"
           main_page.search_text_element = "pycon"
           main_page.click_go_button()
           search_results_page = page.SearchResultsPage(self.driver)
           #Verifies that the results page is not empty
-	  assert search_results_page.is_results_found(), "No results found."
+	  self.assertTrue(search_results_page.is_results_found(), "No results found.")
 
       def tearDown(self):
           self.driver.close()