Update readme to point to links.

Change-Id: I1700d9602519975729e1909dc9be29efa4d2fa32
Allow instance methods to be wrapped and unwrapped correctly.

Change-Id: Ia29e0e8a54fa815dec88016a9444fe7cfad7b8ac
Added generic persistence API and datatypes

Created a generic API and datatypes for storing and
retrieving data from backends. Current backend API
implements a sqlalchemy backend.

Change-Id: I8c979c18380bc5f90901bd01cbd202faa7f9eda4