Disk cache and pipilene config change

[Lukino2000]

Hi,

i just noticed that if you use (at least one time)

pipeline.AddFiles("text/css; charset=UTF-8", "css/test.css")
  .FingerprintUrls();

and change after adding, lets say

pipeline.AddFiles("text/css; charset=UTF-8", "css/test.css")
  .InlineImages(300000)
  .FingerprintUrls();

content returned from server is the old one and changes are not applied