Improved handling of size changes in both InboxRecyclerView and ExpandablePageLayout, especially when they're resized while expanding. This can happen if the soft keyboard is shown. (https://github.com/saket/InboxRecyclerView/commit/7654e48c8279d1e4190cd5d84f17ec02e11faac4, https://github.com/saket/InboxRecyclerView/commit/9d54032a9f6e733c9bfe91a454beaeded91b573d and https://github.com/saket/InboxRecyclerView/commit/c13948ecdfc8508b9310a0e5513baf10d73346b4).

Made InboxRecyclerView#attrs constructor parameter optional so that it can be created from code.

Sample: Restored FAB animation by removing the use of the hidden AnimatedVectorDrawable#reverse() function that no longer works on newer Android versions (https://github.com/saket/InboxRecyclerView/commit/6f0236394415f4603204964dfe8ab785e60a2a8a).