Add start and end rules to RelativeLayout.LayoutParams extensions.

[jimmy-robert]

No description provided.

[4u7]

Thanks for contribution!
Why not to use constants instead of int literals?
And I think those methods should be annotated with @RequiresApi(Build.VERSION_CODES.JELLY_BEAN_MR1)

[jimmy-robert]

Thanks for the review.

I did use constants first but I saw that existing functions alignParentStart and alignParentEnd were using int literals.

I agree that it would be better with constants and with @RequestApi annotation.

I will update the PR with these modifications asap.

[jimmy-robert]

@4u7 PR updated with recommandations.

[4u7]

Thank you!