Merge pull request #159 from hongoctrien/develop

Fix "error save" when change cat news
module authors: add menu create  administrators
module news: Fixed no keyword meta tag
module users: Error correction custom white page when change field
fix edit blocks
module download: del Cache when change file
fix edit blocks
Merge pull request #17 from nukeviet/develop

Update code from nukeviet (15/03/2014)