Add bin/refetch-metadata
Add bin/refetch-metadata

Several scripts, including but not limited to post-to-tumblr, relies on
fetch-metadata being run immediately after a video is made available. This
script takes care of refetching updated metadata (sd => hd, blocked countries,
etc.) after a while, and also takes care of automatically extracting
claims (without manually navigating to the claims page).

SNH48Live/SNH48Live,SNH48Live/SNH48Live