Commits on May 5, 2012

1. Make collectstatic for cached static files more "atomic". …

   The commit moves all cache set to the end of the post-processing phase
   of the CachedStaticFilesStorage class. We do that by keeping a
   dictionary of what needs to be stored to the cache and store that after
   all static files have been post-processed. Additionally, existing cache
   keys are never deleted; instead, we rely on the cache expiration to
   remove not-recently-used keys.
   
   This is convenient for deployments. Ususally, one first does a
   collectstatic and then restarts his application servers. But since the
   cache is (normally) shared with the currently running application
   processes, any change to the static files will be immediately used for
   existing requests. This results in having a previous codebase serving
   newer static files, which might lead to issues.
   
   The commit moves all cache handling to the end, so that the above window
   of serving wrong versions of the static files is minimized. This has the
   added benefit, that one can safely stop the collectstatic command in the
   middle of the execution, without any impact on the existing application
   processes (the old files are always there, anyway).

   Apostolos Bessas committed May 5, 2012
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