SEO, Eventsbox, Date Optiontype, L18n, Sidebar, StaticGenericListLink

* SEO; Yoast plugin was loaded, but not executed
* SEO; Yoast plugin is now also initialized when its not yet initialized
* Eventsbox; new widget
* Date optiontype
* Sidebar; containerpostid was set to postid, instead of containerpostid
* StatisGenericListLink; now refers to containerpostid instead of postid
Merge branch 'master' of https://github.com/nexusthemes/nexusframework