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Treat transducers as iterator transforms at surface syntax (#319)

This patch implements the idea discussed in #67.  That is to say,

```julia
collect(Map(f) |> Filter(g), xs)
foldl(+, Map(f) |> Filter(g), xs)
```

is now written as

```julia
xs |> Map(f) |> Filter(g) |> collect
foldl(+, xs |> Map(f) |> Filter(g))
```

or

```julia
collect(opcompose(Map(f), Filter(g)), xs)
foldl(+, opcompose(Map(f), Filter(g)), xs)

collect(Map(f) ⨟ Filter(g), xs)
foldl(+, Map(f) ⨟ Filter(g), xs)
```

or even (not recommended)

```julia
collect(Filter(g)((Map(f)(xs))))  # Julia >= 1.3

collect(Filter(g) ∘ Map(f), xs)
foldl(+, Filter(g) ∘ Map(f), xs)

collect((Filter(g)' ⨟ Map(f)')', xs)
foldl(+, (Filter(g)' ⨟ Map(f)')', xs)

collect((Map(f)' ∘ Filter(g)')', xs)
foldl(+, (Map(f)' ∘ Filter(g)')', xs)
```

Above syntax are all compatible with the view that `xf(itr)` is an
iterator transformation.  OTOH, `xf'` (`adjoint(::Transducer)`) is now
the "classic" transducer; i.e., reducing function transformation.
This makes it easy to use transducers with other "reducing function
combinators" like `TeeRF`:

```julia
rf = TeeRF(Filter(iseven)'(min), Filter(isodd)'(max))
reduce(rf, Map(identity), xs)  # => (even minimum, odd maximum)
```

This PR only deprecates `::Transducer |> ::Transducer` to help
migration from the old syntax.

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