Fix crash in test suite

testenv/ChangeLog

@@ -1,3 +1,8 @@
+2014-06-22  Darshit Shah  <darnir@gmail.com>
+
+	* (conf.files_crawled): diff is a set object and needs explicit str
+	conversion.
+
 2014-03-13  Zihang Chen  <chsc4698@gmail.com>
 
 	* base_test.py:

testenv/conf/files_crawled.py

@@ -14,5 +14,5 @@ class FilesCrawled:
             diff = headers.symmetric_difference(remaining)
 
             if diff:
-                print_red(diff)
+                print_red (str(diff))
                 raise TestFailed('Not all files were crawled correctly.')