refs #139: customized delay before next try

Signed-off-by: Eric Wang <skygragon@gmail.com>

Author: skygragon

lib/config.js

@@ -68,7 +68,8 @@ const DEFAULT_CONFIG = {
     theme: ''
   },
   network: {
-    concurrency: 10
+    concurrency: 10,
+    delay:       1
   },
   plugins: {}
 };

lib/plugins/leetcode.js

@@ -179,7 +179,7 @@ function runCode(opts, problem, cb) {
   opts.headers.Origin = config.sys.urls.base;
   opts.headers.Referer = problem.link;
   opts.json = true;
-  opts._delay = opts._delay || 1; // in seconds
+  opts._delay = opts._delay || config.network.delay || 1; // in seconds
 
   opts.body = opts.body || {};
   _.extendOwn(opts.body, {