Merge pull request #525 from ma-neumann/master

Allow config.defaultStorageLimit to be zero bytes

lib/historyKeeper.js

@@ -98,7 +98,7 @@ module.exports.create = function (config, cb) {
     paths.staging = keyOrDefaultString('blobStagingPath', './blobstage');
     paths.blob = keyOrDefaultString('blobPath', './blob');
 
-    Env.defaultStorageLimit = typeof(config.defaultStorageLimit) === 'number' && config.defaultStorageLimit > 0?
+    Env.defaultStorageLimit = typeof(config.defaultStorageLimit) === 'number' && config.defaultStorageLimit >= 0?
         config.defaultStorageLimit:
         Core.DEFAULT_LIMIT;