add ExpandableStickyListHeaderListView which enable listview to expand/collapse sub items
Merge pull request #1 from emilsjolander/master

sync with master
add ExpandableListTestActivity
Merge remote-tracking branch 'origin/master'
simplify IAnimationExecutor
update ExpandableListTextActivity
fix divider height calculate logic when collapse items
changes some variable names to improve readability
update  class access-modifier
update  class access-modifier
update readme
update readme
Merge pull request #312 from lsjwzh/master

add ExpandableStickyListHeaderListView which enable listview to expand/collapse sub items