Issue title: How to insert array as params?
 Issue body: In node-mysql 
```
let sql = mysql.format('SELECT * FROM article WHERE id IN ?;', [1,2,3,4,5])
```
it will be translate to the following SQL
```
console.log(sql)
=> SELECT * FROM article WHERE id IN (1,2,3,4,5);
```

Can I do something similar in postgreSQL?

1. How do I insert array as params ?
2. How do I get translated SQL (after parameter insertion) for debug?
 Comments: 
 Comment 0: http://stackoverflow.com/questions/10720420/node-postgres-how-to-execute-where-col-in-dynamic-value-list-query
{'source': 'GithubIssues', 'repo_name_with_owner': 'brianc/node-postgres', 'issue_id': 226857574, 'repo_stars': 11596.0}