workflows: classifier results in workflow description fix

* Adds classifier results in holdingpen description column
  for proccess_record_arxiv workflow.


Right now, it is displayed as:

```
    Bibclassify result:

    Number of Core keywords: 0
    PACS:0
```

What about a bit more minimized:
```
CORE Keywords: 3  PACS: 0/0
```
Perhaps using [badges](http://getbootstrap.com/components/#badges)?