[newFeature] deal with img elem, add attrs for imglazyload
Merge remote-tracking branch 'upstream/dev' into dev
Merge remote-tracking branch 'upstream/dev' into dev
[bugfix] optimize imglazyload
[bugfix] add new demo for imglazyload
Merge remote-tracking branch 'origin/dev' into dev
Merge pull request #24 from zhoumm1008/dev

Dev