Typeahead new features

[inqwell]

Suggested additions to typeahead:

• If the :data-source function returns a single element then this is automatically selected. This is not configurable as currently implemented, it seemed a subtle enough change not to upset anyone, but could be optional of course

• If the typeahead list is long enough to scroll, the list doesn't autoscroll with the keyboard. Added code to fix this.

• I wanted the full list to become visible without actually typing anything. I added code so down-arrow will display the list, which it does by calling :data-source passing the keyword :all. This isn't a breaking change, in that an empty list would be returned anyway if the client doesn't implement this. This mod leaves the way open for adding a dropdown button, should someone want that.

• If the :get-index function is supplied, when the list is popped down as above the current item is shown selected.

• May be the selections list is the result of an ajax call using the text the user is typing and invoked from :data-source. In this case the ajax result handler would set an atom, so I added an option for this to be user-supplied via :selections.

See source code for the demo page for a full example.

[yogthos]

Looks great, I just pushed out a new release to Clojars. Thanks for the PR. :)

[inqwell]

Excellent, thanks. Always nice to put something back :)