Merge remote-tracking branch 'origin/master'

Merge pull request CymChad#185 from shichaohui/master

fix CymChad#184

fix 161

Merge pull request CymChad#176 from shichaohui/master

Fixed the problem that addHeaderView does not show after removeHeaderView.

Merge pull request CymChad#175 from a5533348/master

Add function for OnItemChildLongClickListener

Merge pull request CymChad#170 from shichaohui/master

Add multiple header and footer feature

Merge remote-tracking branch 'origin/master'

Merge pull request CymChad#162 from elfman/master

The views create by adapter can not be swiped

Merge pull request CymChad#158 from elfman/master

Update README.md about item drag and swipe function

Merge remote-tracking branch 'origin/master'