NotFound is called when no asset is found. It defaults to http.NotFound but can be overwritten
Server is simply ServeHTTP but wrapped in http.HandlerFunc so it can be passed into net/http functions directly.
Hash returns the hex-encoded SHA256 hash of the original file Used for the Etag, and useful for caching Returns an empty string if the file is not in the bundle
ModTime returns the modification time of the original file. Useful for caching purposes Returns zero time if the file is not in the bundle
Open allows you to read an embedded file directly. It will return a decompressing Reader if the file is embedded in compressed format. You should close the Reader after you're done with it.