Merge pull request #2202 from pandamicro/develop

@Improve inline docs
Fixed three bugs that it sets to other value when the parameter is 0.
Merge pull request #2203 from dingpinglv/develop

Fixed three bugs that it sets to other value when the parameter is 0.
Updates AUTHORS.txt
Merge pull request #2205 from dingpinglv/develop

Updates AUTHORS.txt
Fixed a bug of ccui.TextField
Merge pull request #2206 from dingpinglv/develop

Fixed a bug of ccui.TextField
Update docs for RC3 release