dschep / ntfy / 587

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travis-ci

WIP of #125: screen locking detection

separate backends implemented via a 'multi' meta-backend.
Uses config like this:

```
backends: [multi]
multi:
    locked:
        pushover:
            user_key: user-api-key
    unfocused:
        default: {}
    focused: {}

```
This config would cause no notifications if the shell is focused, desktop
notifications when unfocused, and pushover notifications when the screen is
locked. Freaking magic. :tada:

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