bug: button-bar not styled correctly

[dylanvdmerwe]

The button-bar component is no longer being styled correctly in the latest version 1.2.4.

See example here:
http://codepen.io/anon/pen/VepBEQ?editors=100

Compare this:

To the documentation:

[venu1412]

+1, We are also facing the same issue. Its introduced newly from 1.2.0.

[mlynch]

Fixed, thanks!

[joeljameswatson]

I think the underlying issue here may actually be related to the button-style mixin as I'm seeing the same issue on other buttons. Please see this issue

#5576