Merge pull request #56 from thangbv/develop

Edit config_value and config_name smtp.php
config method google analytics
optimize url module about, new for SEO
Update timezone.php
change cronjob online expired delete
Merge branch 'develop' of git@github.com:nukeviet/nukeviet.git into develop
config ckeditor entities
change block global html
Module News: add autocomplete for tag
install: fix variables no exit
theme admin: change font menu
module bannner: fix delte banner
optimize element tags Heading
Module upload: add tag alt for image
optimize Breadcrumbs for SEO
https://support.google.com/webmasters/answer/185417?hl=en&ref_topic=1088474
module News: optimize rate for SEO
CKEditor 4.2.1
Module News: add Facebook social plugin Comment
module News: Add Like facebook, G+ , twitter
optimize function nv_alias_page for SEO