Enable logging of workout metrics

[brianmarco]

Log all the pertinent data for sets after each set is completed.

• User should be able to review this data both during the current workout as well as after.
• Simple data format for now.
• User should have the ability to delete entries (but this is probably more like a n+1 feature).
• User should be able to download this data off device (again, more like an n+1 feature).

[brianmarco]

More information on how to do this is here:

http://developer.blackberry.com/native/documentation/cascades/device_platform/data_access/index.html