Show only top level terms in Block

Issue Summary

Hi Nancy

Thanks for limiting the block to a certain vocabulary

Can you please enable us to hide the child terms in the menu block.

E.g

Vocabulary Name: Plants

Term1: Fruit (show)
-- Term2: Apples (hide)
--- Term3 Toffee Apples (hide)
-- Term4: Peach (hide)
--- Term5: Toffee Peach (hide)
Term6: Vedge (show)
-- Term7: Pumpkin (hide)
-- Term8: Butternut (hide)

but when you visit the term Fruit all terms under it must show in the block, and if they should have child terms, they should be hidden

E.g

Vocabulary Name: Plants

-- Term2: Apples (show)
--- Term3 Toffee Apples (hide)
-- Term4: Peach (show)
--- Term5: Toffee Peach (hide)

Thanks