liip/LiipImagineBundle — pull request #32 by mheleniak (2011-11-06 10:22:26+00:00)
Title: added last-modified header when the image is stored on disk

I know we discussed this in GH-16 but I think this is good design to place this code in `CachePathResolver#store`.

`Last-Modified` header is not application specific so there shouldn't be any problems.

This is really small but useful change. Hope you will agree @lsmith77

cc @LouTerrailloune