0.12.13

Fixed

• Observer will only attempt to convert a data object if it is not a native object, e.g window.
• #1219 inherit: true constructor cache should be context-sensitive
• #1248 performance regression when v-repeat has a particularly large source Array.
• #1241 Triggering a transitionend event after enter transition is done in in-out mode causes error (@nkovacs)
• #1244 Leave transition hook is called twice if css:false in in-out mode

Improvements

• Added space alias for key filter. (@Coffcer)