v1.1.0

• new prop: track-by
  replace detail-row-id and default id for __checkbox field
• new special field: __handle and new css class: sortHandleIcon
  for working with Sortable.js
• new events for __checkbox: vuetable:checkbox-toggled and vuetable:checkbox-toggled-all, thanks @abishekrsrikaanth for suggestion.
• use <transition> tag for detail row