Merge pull request #43 from heyongjian/master

merge pull request
wanghao:judge whether the server supports breakpoint resume(HTTP)
wanghao:issue-30,crash when you drag the icon on the desktop
wanghao:fix bug issue-23,can not scroll when pageiew less than one
Merge pull request #134 from lwanghaol/master

wanghao:fix bug issue-30,crash when you drag the icon on the desktop