BackendFaqModel updated

Now uses BackendModel::deleteExtraById() and BackendModel::updateExtra()
BackendContentBlocksModel updated

Now uses BackendModel::deleteExtraById() and BackendModel::updateExtra()
BackendLocationModel updated

Now uses BackendModel::deleteExtraById() and BackendModel::updateExtra()
Changelog updated
Merging master
Removed redundant comments in Faq
Removed redundant comments in Location
Merge branch 'useUpdateExtra' of git://github.com/jeroendesloovere/forkcms into jeroendesloovere-useUpdateExtra

Conflicts:
	CHANGELOG.md
	src/Backend/Modules/Location/Engine/Model.php
Merge branch 'jeroendesloovere-useUpdateExtra'