.map using a pipeline

How would you preform a .map using a pipeline as the target?

This is what I came up with so far:

```
const $ = require('highland');

function (input, processArray, concurrency) {

return $(input)
.map(record => $([record]).through(pipeline(processArray)))
.mergeWithLimit(concurrency);
}
```

Start by reviewing the issue's proposed function and the map, through, and mergeWithLimit entry points it uses. Determine whether the requested pipeline target is an existing capability or requires a new API, then verify the intended behavior with a focused stream example. Done means the pipeline can be used as the map target with the requested concurrency semantics.

Written by the indexing model from the issue text.