Update readme to install gcc/cc

See merge request memri/pod!174

Clarify bulk atomicity

See merge request memri/pod!173

Add timeout to curl test

See merge request memri/pod!172

Clarify Shared Pod docs

See merge request memri/pod!171

Mention the `owner` key explicitly

Add a curl test

See merge request memri/pod!170

Downgrade tokio to avoid run-time error

See merge request memri/pod!169

```
thread 'main' panicked at 'there is no reactor running, must be called from the context of Tokio runtime', ~/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-0.2.22/src/io/driver/mod.rs:201:9
```

Update libraries

See merge request memri/pod!168

This commit also fixes a cargo-audit warning

Update HTTP API

See merge request memri/pod!165

Separate schema file from compilation

See merge request memri/pod!166

Release v0.2.1

See merge request memri/pod!164

Update deps

See merge request memri/pod!163

Instead, use one chosen indirectly by refinery

progress to float

See merge request memri/pod!160

Improve docker port binding

See merge request memri/pod!155

schema update release

See merge request memri/pod!161

add progress message

See merge request memri/pod!159

status and error messages for importer runs and indexer runs

See merge request memri/pod!158