Merge pull request #283 from voltan/develop

Update themes and add support some SEO element and support mobile view
code cleaning up
Restored mod_rewrite check to fix Issue #251 identified by @MarcoXoops
Fixes Issue #287 by adding error page for db connection error
Fixes Issue #287 by adding error page for db connection error
Code cleaning up for Db model
Changed updateMeta event order
Added support for cloned module classes with class_alias