title: Is there a way to get distinct PartionKeys from a Table
body: <p>Currently I'm using the PartitionKey to differentiate devices that are storing data into Azure Table Services.  I'd like to build a viewer that allows me to browse that data, but it would be nice to be able to structure it so I can view data "by device", or by PartitionKey.  The viewer app won't have any knowledge of what devices exist, so it would be great if I could somehow get back a list of distinct PartionKeys in a given Table.  Is this possible, or am I going to be relegated to creating a meta-data table into which I insert a new row for each device, then use that for querying?</p>