selectedKeys() function stores incorrect indices

[Mike Overbeck]

I found that selectedKeys() in objects/property.js stores keyframe indices starting at 1. Say you have key 4 , 5 , and 6 selected, selectedKeys stores key 1 , 2 , and 3. This can be fixed by changing at line 74:

        selectedKeys.push( this.key( i ) );

to selectedKeys.push( this.key( this.property.selectedKeys[i-1] ) );

[Rune Gangsø]

object/property: Fix selectedKeys returning wrong keys

fixes: #51

→ <<cset 881c6a0fc942>>