Cachish

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Added
- A generic JSON backend: JsonHttp. Configure with a url and field (possibly several) to extract.
- Configureable logging with metrics

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Fixed
- Failed to start if configured with more than one item
- `~/.netrc` files are now ignored to prevent them overriding authentication

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Changed
- Configuration of auth tokens changed from `<token>: <url>` to `<client_name>: {token: <token>, url: <url>}`

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First release!