Make dropdown only open for numbers or letters (on top of the already used up/down arrows, enter, space and escape).  Fix bug that caused long list to not have a max size
Merge pull request #467 from truckingsim/master

Fix bug with max-height and adjust which keys can open select
Add the ability to add custom no result text or html.
Adjust to use previously merged "noneResultsText".
Fix up/down navigation