add support for multiple prop

[cinderisles]

• added search-input prop for vuetify-algolia-places component that syncs with v-autocomplete's search-input (possibly fixes Missing reactivity #132)
• model can now be an object or an array, in order to support v-autocomplete's multiple prop
• added link to v-autocomplete docs
• updated playground with props for experimenting with multiple, chips and deletable-chips
  • usage code updated accordingly
  • model output example doesn't include hit and rawAnswer when model is an array

If this looks good to you, I'll update the README