fix #42
fix a bug caused by the type of some default properties
add callback pending
add fileInfo length judgment
add Richboxgroup and fix some bug of Uploader
add notation and make Richboxgroup inherit from BoxGroup
Merge branch 'dev' of https://github.com/ecomfe/bat-ria
add return code mode
Merge pull request #43 from chestnutchen/master

fix #42