improve DX of working with styles

[loreanvictor]

• units MUST always be specified, which is an inconvenience. Perhaps for a specific list of values px can be assumed as default (or other units based on the value itself)

• camelCase resolution would improve DX a lot, as right now you would need to switch to quoted attributes

• generally making the behavior more consistent with default preset of JSS would be a good idea due to consistency. additionally, adding plugins to JSS for adding goodies of styles (like expanded transforms and transitions) would be pretty neat.