Call out default google credential file name and also add to gitignore for both variants listed in config.

.gitignore

@@ -3,3 +3,5 @@
 .*.uptodate
 *.egg-info
 build
+google_creds.json # This is because the default credential location is noted as such.
+creds.json # Listed as credentials in schedulebot reference jsonnet config.

INSTALL.md

@@ -44,7 +44,7 @@ After making any changes to `docker-compose.jsonnet`, you will need to rerun `ge
 
 By default the `downloader`, `restreamer`, `backfiller`, `cutter`, `thrimshim`, `segment_coverage` and `nginx` services of the wubloader will be run. To change which services are run edit the `enabled` object in `docker-compose.jsonnet`. A complete wubloader set up also requires one and only one `database` service (though having a backup database is a good idea), one and only one `sheetsync` service and one and only one `playlist_manager` service.
 
-If you are running a `cutter` you will have to place the appropriate Google credentials in a JSON file given by the `cutter_creds_file`. Likewise, if you are running the `sheetsync` service, you will have to place the appropriate credentials in the JSON file pointed to by `sheetsync_creds_file` as well as set the appropriate `sheet_id` and `worksheets` for the Google sheet to sync with. You will also need to set the appropriate `edit_url` to access `thrimbletrimmer`.  
+If you are running a `cutter` you will have to place the appropriate Google credentials in a JSON file given by the `cutter_creds_file` (google_creds.json in the root repo by default). Likewise, if you are running the `sheetsync` service, you will have to place the appropriate credentials in the JSON file pointed to by `sheetsync_creds_file` as well as set the appropriate `sheet_id` and `worksheets` for the Google sheet to sync with. You will also need to set the appropriate `edit_url` to access `thrimbletrimmer`.  
 
 ## Running Wubloader