Merge pull request ebarrenechea#11 from GrahamFirst/master

Check for RecyclerView.getChildAdapterPosition returning NO_POSITION

Merge pull request ebarrenechea#10 from edubarr/develop

Tweak clear cache PR

Merged in develop (pull request ebarrenechea#5)

Removing unneeded resources.

Double header feature

Merged in develop (pull request ebarrenechea#2)

Double sticky headers feature