Merge pull request #4 from nukeviet/develop

Develop
change config backup database
change config system
fix search for module upload
change fomat date
optimizer css
Merge pull request #10 from vuthao/develop

Develop
fix admin relogin
Update module upload
Merge pull request #11 from vuthao/develop

Develop
optimizer file tpl
fix image not exit in file css
Add function: Hosting CDN for javascript, css
Merge pull request #12 from vuthao/develop

Develop
module upload: fix data setup
Module News: Using thumb images created by the upload module
Merge pull request #13 from vuthao/develop

Develop
Module News: Fix lang admin_vi.php
Module Users: Fix lang admin_vi.php
Add default variable in config global