Autocomplete tweaks: remove search blocker, fix debounce params #869

This is to address #869 (closed)

I changed the debounce parameters makes sure it doesn't fetch on the initial character but when you stop typing.

I removed the "don't search if we already have some results" as it can make it impossible to get the results you want, and added a list of recent queries to remove duplicate searches.

src/components/emoji_input/suggestor.js

-import debounce from 'lodash/debounce'
+import { debounce } from 'lodash'
 /**
  * suggest - generates a suggestor function to be used by emoji-input
  * data: object providing source information for specific types of suggestions: