Update pathlib imports to pathlib2.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/common/javascript.py

@@ -8,7 +8,7 @@ import shutil
 import tarfile
 
 from furl import furl
-from pathlib import Path
+from pathlib2 import Path
 import requests
 from semver import max_satisfying
 

mayan/apps/common/management/commands/convertdb.py

@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 import errno
 import os
 
-from pathlib import Path
+from pathlib2 import Path
 
 from django.conf import settings
 from django.core import management