shukaka

Results 3 issues of shukaka

### What were you trying to do? i start a simple demo, just load a pdf file, then save it as a new file, without any other operation ### Why...

bug
not-stale

The DGElasticPullToRefresh has a top mode refresh by default, how could we use it by the bottom mode?

enhancement

if i want to lay the text at center, how to set the ZCAnimatedLabel ?