Fixing bug when suggestions length is less than the limit

[lukebergen]

A bug occurs when the number of suggestions is less than the limit.
Before, async update would give back suggestions.slice(0, limit - rendered) but in cases where number of rendered suggestions is less
than limit, this would result in missing suggestions.

e.g. Say the limit is 5 and the list of suggestions for my query "foo"
comes back as ["food", "fool", "foot"], this would result in appending
["food", "fool", "foot"].splice(0, 5 - 3) //=> ["food", "fool"] which
is missing the legitimate suggestion "foot".

Also in setting this up locally I scratched my head for a bit before figuring out that I needed to install Bower and run bower install. Updated the README to include those instructions.

[lukebergen]

Oops, I did not see #1485 and #1451 when I put this together or I'd have just upvoted their PRs. Shall I close this in favor of one of those two?

[jlbooker]

Duplicate of #1212 - This project seems to unmaintained. Try the fork at: https://github.com/corejavascript/typeahead.js

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