[bugfix] add comment
Merge remote-tracking branch 'origin/dev-2.0.0' into dev-2.0.0
[bugfix] FEBASE-689, fix threshold bug
[bugfix] FEBASE-688, toolbar bug for ios4, fixed in common header
[bugfix] modify comment
[bugfix] add api doc for refresh
[bugfix] modify demo for refresh.lite demo
[bugfix] refresh list bug
Merge remote-tracking branch 'origin/dev-2.0.0' into dev-2.0.0