Support array of objects in `bind-style`

This used to work for me in 0.12 (cFont and cTextAlign are computed functions)
`<div v-style="cFont, cTextAlign">`
where cFont and cTextAlign return an object with multiple values, however in 1alpha (bind-style) only the last one is used, e.g. my text is aligned but not coloured/styled, and if I reverse them, it's coloured/styled but not aligned. 
