Add a static caching library
Add route for images within a files/ subdirectory
Cache files, if possible
Ignore the files/ directory with cached output
Change file URL to pull from files/ subdirectory
Add a note regarding the legacy file route
Merge pull request #36 from saltybeagle/35_cache_static_files

Cache images and other static files to the filesystem
Merge branch 'master' of github.com:unl/UNL_ENews