reverted VertexData from ByteArray to Vector - temporarily

The problem with ByteArrays is that each instance takes up 4k of memory. Until this is either changed in AIR or I have created a workaround, I have to switch back to Vector. I don't want to delay Starling 1.4 any longer, so I will publish it like that and tackle ByteArrays in 1.5.
updated change log for 1.4 rc2
updated SWC file to RC2, now including api documentation