fix(arrays): fix arrays of intervals, etc

[benjie]

Fixes #390

This is a bugfix, but people may be relying on this broken behaviour. If they are, they can opt out of this fix via disableIssue390Fix flag:

CLI: add to .postgraphilerc.js:

module.exports = {
  options: {
    graphileBuildOptions: {
      disableIssue390Fix: true
    }
  }
}

Library:

app.use(postgraphile(DB, SCHEMAS, {
  graphileBuildOptions: {
    disableIssue390Fix: true
  }
}));