Adding provider extended attributes to API ref page

Partial-Bug: #1157159

Change-Id: I048eaec00167e35cd7cf93a46b4647ffbbacb778
author: diane fleming
Fix compute WADL - errors found by David Cramer

Change-Id: If6044850e0e7aa5728121ba10ed32434873c0e54
author: diane fleming
Merge "Adding provider extended attributes to API ref page"