[pdal] PDAL Pipeline Extensibility

[Howard Butler]

> On Dec 21, 2016, at 9:36 PM, Rob Emanuele <rdemanuele at gmail.com> wrote:
> 
> If that's correct, I would say instead of "application", some better terms would be "tags", "userData", "userTags", or something along those lines.

Yes, I was hoping for a better name here. I was also hoping there was a standard way that people were extending JSON like this, and that we would just support it. I haven't found anything thus far though.

Howard