Feature request: Support for different ways to pass multiple parameters

[bradvogel]

Following up on #1, it would be nice for iron-url to support more styles:

/path?foo[]=a&foo[]=b parsed into this.params.foo === ['a', 'b']

/path?foo=a&foo=b parsed into this.params.foo === ['a', 'b']

/path?foo[]=a parsed into this.params.foo === ['a']

/path?foo=a parsed into this.params.foo === 'a'

Express uses qs to do this: https://github.com/hapijs/qs/blob/master/test/parse.js#L73

[bradvogel]

I can file a PR if this proposal looks OK.

[mitar]

I would also really want/need this. I would add one more:

/path?foo=a&foo[]=b parsed into this.params.foo === ['a', 'b']
/path?foo[]=a&foo=b parsed into this.params.foo === ['a', 'b']

[mitar]

Can you please make a pull request? :-)