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Index ranges, closes #138

This PR adds the ability to specify ranges as indexes (`[x]`).
A range is a colon-separated pair of boundaries which can be
either an integer (`[1:10]`) or omitted (`[1:]`).

```
⧐  "Hello world"[0:2]
He
⧐  "Hello world"[0:5]
Hello
⧐  "Hello world"[:5]
Hello
⧐  "Hello world"[5:]
 world
⧐  "Hello world"[:-1]
Hello worl
⧐
```

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