Allow style to be set directly on Tab components.

[happycollision]

Tab components are the only things inside Tabs components that aren't really wrappers. They, in my experience, are often the actual element that users will interact with. Rather than

<Tab><span style={style.tab}>My Tab</span></Tab>

It might be nice to

<Tab style={style.tab}>My Tab</Tab>

[danez]

This was done in #93