Update CLI to enable data query and download

[sgosline]

Currently we are focused on the python functionality of this package, but it would be helpful for people to be able to download the data directly if they so desire.

Let's focus on three commands:

coderdata list
lists available datasets by name, and their datatypes
coderdata download --dataset [datasetmame] --type [typename]
download a specific type of data for a dataset
coderdata types --dataset [datasetname]
download entire dataset
coderdata version
version of package/data with build date/release date.

Anything else I'm missing?