robertzk/mungebits — pull request #11 by robertzk (2014-08-13 21:47:44+00:00)
Title: add ability to add multiple criteria for column selection in column_tran...

We can now do things like this in data preparation:

```R
"Replace negative with NA" = list( your_mungebit, list(is.numeric, const$tu_variables), ...)
```