Starting implementation of Yoast WordPress SEO Plugin support for the sections. 
It will add the sections content to the score evaluation of Yoast.
Updated readme with changelog and version increase.
Merge branch 'release/1.3.0' into develop
get slug helper method
comments
Merge branch 'feature/helperMethods' into develop
Merge branch 'develop' into feature/shortcodes

Conflicts:
	lib/Pronamic/WP/Sections/Section.php