Adds udunits
Updated setup.py
Add route to SGS to delete attachments
Return value from RR delete attachment
Merge pull request #919 from daf/sgs_delete_attachment

Add route to SGS to delete attachments
Modify SGS attachment routes to use gateway_json_response
Merge pull request #921 from daf/sgs_attachment_returns

Modify SGS attachment routes to use gateway_json_response
Updates udunitspy version
Merge pull request #922 from lukecampbell/udunits

Adds UDUNITS to coi-services
merge upstream/master