allow to insert new content with autocomplete
add insert option on non-multiple autocomplete
add doc for insert_option on the autocomplete
change the name of the event (based on modifications on PR#137 on novius-os/core)
use a fake id as it is impossible to rely on a "reel" one
Merge pull request #6 from vrcAlbert/feature/insert_option

Feature : "insert" option on autocomplete