Merge pull request #266 from lukecampbell/uns_patch

Changes the extended attribute to point to a wrapping svc call
r2deploy mod (NOT MEANT TO BE MERGED INTO MASTER)
Adds new fields to parameter contexts for searching.

ParameterContextResource now has value_encoding, fill_value and unit_of_measure fields to aid in searching for
specific parameters.
Moves r2deploy changes to r2params.yml
Changes to pdefs
Updated CSV files
Updates to csv
CSV changes