MOOSE parameters with discrete sets of values will display with a combo
box now. Works via creating a MOOSE Model from scratch and by importing.

Signed-off-by: Anna Wojtowicz <wojtowicza@ornl.gov>
Merge branch 'master' of https://github.com/eclipse/ice
Added unit tests for parameters with discrete values.

Signed-off-by: Anna Wojtowicz <wojtowicza@ornl.gov>