obvious fix for header click handler

if user do not provide "OnHeaderClickListener", the header view will not be clickable,
so user will be able to "get" to the underlying views and handle clicks by himself
add ExpandableStickyListHeaderListView which enable listview to expand/collapse sub items
Bump version
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
fix current header touch interception,
update current header click listener when setOnHeaderClickListener called
update readme
small code refactoring
update readme
AddFooter(View, Object, boolean) is updated to add the view to the internal view store for consistency
Merge pull request #301 from Yarikx/master

obvious fix for header click handler
Merge pull request #312 from lsjwzh/master

add ExpandableStickyListHeaderListView which enable listview to expand/collapse sub items
Merge pull request #316 from greggiacovelli/fix_footer_remove

AddFooter(View, Object, boolean) is updated to add the view to the inter...