Add attrs.xml file to start working with styleables
Remove new attrs.xml file. I'm going to use the already created one
Add new styleable, format reference, to attrs.xml file
Rename topViewId attribute to animableViewId
Initialize animableView using animableViewId attribute. If animableViewId is not assigned is going to use child at position 0 or 1
Modify basic sample fragment to use the new feature
Add id to bottomLayout and modify condition to initialize animableView with a view or other inside ExpandablePanelView
Remove unused identifier in fragment_basic_behaviour.xml
Add animateViewId attribute to fragment_inverse_behaviour.xml sample
Reformat code
Improve README.md with information about the new attribute.
merge/pull-request-merge-pedrovgs:cusomize-top-view-with-xml-attribute