Align for let forms

[fommil]

it would be really great if let forms could be automatically aligned by value, e.g.

(let [foo bar
        a baz])

instead of (note baz does not align with bar)

(let [foo bar
      a baz])

I'd also be happy with

(let [foo bar
      a   baz])

(i.e. left align the variable)

[arrdem]

I've never seen right variable alignment in a let form. The double left alignment is a duplicate of #36.