Make QueryString.parse run faster
Make QueryString.parse run faster

Use decodeURIComponent when appropriate, and only fall back to
querystring.decode if it throws, or if the character is a '+'.

Fix #2248

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node