Resolves #11 by only outputting borderRadius prop

[jh3y]

Change grammar to only output borderRadius instead of borderTopLeftRadius etc. which doesn't seem to have an effect when developing for native.

One solution could be to output them all together to cover all bases but I'm not sure if this is necessary.

Would be happy to update if you'd rather it included all props though 😄

The tests pass and as stated in my original issue here only using borderRadius works as expected within native and this was the case with styled-components version 1.0.11.

@jh3y

[jacobp100]

It's by design.

border-top-left-radius: 2;
border-radius: 5;

This should give a border top right radius of 5, which is what we get.

It's also worth mentioning that border radius can accept multiple values as a shorthand.