Serialize DateTimeOffset values as string if out of range
Throw InvalidOperationException if we cannot parse date
Add assertions to tests
Use equality checks instead of IsTrue
Rethrow table storage IOE if we cant handle it
Use a DT -> string serialization format with more precision
Update to Storage 2.0.6
Add minvalue test

We now have tests covering min value, max value, and an
arbitrary value that isnt a valid edm datetime
Switch on edm type instead of using exceptions
"Handle" emulator quirk by informing the user about it