[Findit] Fix redirect bug and update template for waterfall/culprit.

appengine/findit/main.py

Index: appengine/findit/main.py
diff --git a/appengine/findit/main.py b/appengine/findit/main.py
index 446bdd5c35cf65549c94a664067348889a263196..d3399045b9e834cd7fc69997dfe01e9ba102e007 100644
--- a/appengine/findit/main.py
+++ b/appengine/findit/main.py
@@ -11,6 +11,7 @@ from findit_api import FindItApi
 from handlers import build_failure
 from handlers import check_duplicate_failures
 from handlers import config
+from handlers import culprit
 from handlers import failure_log
 from handlers import help_triage
 from handlers import list_analyses
@@ -65,6 +66,7 @@ waterfall_frontend_web_pages_handler_mappings = [
      check_duplicate_failures.CheckDuplicateFailures),
     ('/waterfall/check-flake', check_flake.CheckFlake),
     ('/waterfall/config', config.Configuration),
+    ('/waterfall/culprit', culprit.Culprit),
     ('/waterfall/failure-log', failure_log.FailureLog),
     ('/waterfall/help-triage', help_triage.HelpTriage),
     ('/waterfall/list-analyses', list_analyses.ListAnalyses),