Add support for multiple-parameters

For #256.
Also removes deprecated 'getLearnedElement' method in unit tests
Merge pull request #291 from bruttenberg/DEV2.4.0

Fixes for #224
Merge pull request #286 from mhoward2718/DEV2.4.0

Add support for multiple-parameters
Merge pull request #2 from p2t2/DEV2.4.0

Dev2.4.0