Added db router
Added MetaTags component
Added Google Webmaster Tools and robots.txt
Added google analytics component
Fixed update for exist key with empty value
Added robots.txt, Google Analytics and Google Webmaster tools settings forms
code style
Added class AllowedTargetList
Added sitemap.xml generator
Added static routes for sitemap.xml, robots.txt and Google Webmaster Tools
Added getters and setters
Fields are set as nullable
Added savings methods
Added seo settings control
Code style
Added component used for set up all targets meta data (seo and sitemap parameters)