Support Parameters on ResultTable and ResultColumn

We would like to be able to add information such as unit, limit or default axis information to columns published to Publish Result. Also it would be useful to be able to attach additional information to the ResultTable itself regarding the measurement that was made.

We need the following changes: ResultTable - actually support the parameters instead of always returning an empty set of parameters. ResultColumn - Add parameters to the columns. UnitAttribute - Support unit attribute by adding the metadata to the column properties. This can be done for PublishResult<T>(IEnumerable<T> results) or PublishResult<T>(T result).

Add support to some existing result listeners.

Related issue: #33