Support method chaining without closure

[McRaeAlex]

When using pipe! it works well with functions however often you need a combination of methods and functions. In order to make this clean and not rely on multiple pipe! invokations we should support using the unit type () in place of the value.

pipe!(val, func(), ().method())

It may not bee needed however as these methods could just be chained onto the previous function call.

pipe!(val, func().method())

unsure if this is worth implementing or not. I think if I continue using the macro and it becomes an issue I will change it.