Merge branch 'master' into dev

lib/downloader.js

@@ -175,6 +175,9 @@ function reset() {
 }
 
 function doLru(size) {
+  if (size > MAX_SPACE_IN_B) {
+    return Promise.reject()
+  }
   return new Promise((resolve, reject) => {
     let totalSize = savedFiles[KEY_TOTAL_SIZE] ? savedFiles[KEY_TOTAL_SIZE] : 0;