Update support library to 25.4.0

[zawadz88]

Android Support Library 25.4.0 has been released: https://developer.android.com/topic/libraries/support-library/revisions.html#25-4-0
Along with it comes support for animating pathData in animated vector drawables.

This could be used for the circle -> warning icon animation we have in tabs when a step validation fails. Currently we animate pathData only on Lollipop+ and use a fallback on older devices.

[zawadz88]

Merged to develop, this will be a part of 4.0.0 since it introduces breaking changes (will crash if someone is using Android Support library older than 25.4.0)