Added new checksums and allows for relative directories (#3128)

Scrivener.gitignore

@@ -1,7 +1,8 @@
-/Files/binder.autosave
-/Files/binder.backup
-/Files/search.indexes
-/Files/user.lock
-/Files/Docs/docs.checksum
-/QuickLook/
-/Settings/ui.plist
+*/Files/binder.autosave
+*/Files/binder.backup
+*/Files/search.indexes
+*/Files/user.lock
+*/Files/Docs/docs.checksum
+*/Files/Data/docs.checksum
+*/QuickLook/
+*/Settings/ui.plist