Dropdown menus get cut off when list is long

[adamlundrigan]

Example from zend-validator docs (direct link)

Only the first N links of the "Validators" sub-menu are visible.

[bfolliot]

We can juste add :

max-height: 340px;
overflow-y: scroll;

If you are ok, i can make a pull request.

[froschdesign]

@bfolliot
Thanks for your input / idea. I will test it.

[froschdesign]

We will remove the dropdown menus. See: #34