rustypaste - minimal file sharing

Upload:    curl -F 'file=@filename' -H 'Authorization: <token>' https://paste.sevos.io
Expiry:    curl -F 'file=@f.txt' -H 'expire:1h' -H 'Authorization: <token>' https://paste.sevos.io
One-shot:  curl -F 'oneshot=@f.txt' -H 'Authorization: <token>' https://paste.sevos.io
Shorten:   curl -F 'url=https://example.com' -H 'Authorization: <token>' https://paste.sevos.io

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