asynchronous sources are rendered with the wrong limit

[kr1x]

When retrieving the suggestions asynchronously, the number of returned items is set to the number of rendered items BEFORE creating the slice of the retrieved items that should be appended.

For example: limit is 5 and we returned exactly 5 items.

rendered += suggestions.length;
that._append(query, suggestions.slice(0, that.limit - rendered));

This would lead to rendered = 5 and the slice function gets 0, 0 as arguments and therefor, there won't be any suggestions appended.

Please see #1312 for more information and the discussion

[jlbooker]

Looks like a duplicate of #1212, has been fixed over at corejavascript/typeahead.js#8

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