Import safe_join from werkzeug.security

Fixes #110.

Author: hagai-helman

git_deps/server.py

@@ -12,8 +12,9 @@
 def serve(options):
     try:
         import flask
-        from flask import Flask, send_file, safe_join
+        from flask import Flask, send_file
         from flask.json import jsonify
+        from werkzeug.security import safe_join
     except ImportError:
         abort("Cannot find flask module which is required for webserver mode.")