Resolved issue #16, where Description was not being picked up from <proxyname>.xml

Resolves the issue where the Description is not picked up from the <proxyname>.xml file. This now will display on Apigee Edge whatever is in the Description tags. 

If there are no Description tags, it bombs. This may be another issue to look into. I tested it with the changes I made as well as the existing plugin, both had the same behavior.
If the Description tags are present, but there is nothing in them, it will revert back to the previous behavior, with the username, git hash, etc.