Adds explicit version of blist

It seems like a workaround. Better solution is update
virtualenv to >= 1.11.

Change-Id: I5cd00217cc9eb0eae641f8da40259257b73140e9
Closes-bug: #1293534
Adds dummy put_item API method

Adds dummy put_item, test for it. Adds directories for
API Controllers.

Change-Id: Idd3f6279ba451ce18f25477418cbcec03b0d2278
Blueprint: os-restful-api-put-item