Make b2 work again

I feel like this thing breaks every time I look at it. Probably will
just use boto (or smart_open and give up on direct api calls entirely),
but for now...

pog/fs/b2fs.py

@@ -4,12 +4,14 @@
 from subprocess import check_output
 
 from b2sdk.v2 import B2Api
-from b2sdk.exception import FileNotPresent
+from b2sdk.v2.exception import FileNotPresent
 
 from .pogfs import Pogfs
 
 
 BUCKET_NAME = environ.get('B2_BUCKET_NAME')
+APP_ID = environ.get('B2_APPLICATION_KEY_ID')
+APP_SECRET = environ.get('B2_APPLICATION_KEY')
 
 
 class b2fs(Pogfs):
@@ -18,6 +20,7 @@ def __init__(self, bucket_name=None, **kwargs):
 
     def _get_bucket(self):
         api = B2Api()
+        api.authorize_account('production', APP_ID, APP_SECRET)
         return api.get_bucket_by_name(self.bucket_name)
 
     def exists(self, remote_path):