Added editor-styles
Additions of tabs shortcode
Fixed old PHP versions not liking array index on function return
Fixed another instance of old PHP versions not liking array index on function return
Merge master into tabs

Conflicts:
	functions.php
Added dotted column borders in editor-style
Wordrpess 3.9 : [responsiveimage] now rendered correctly when first added to editor
Updated readme with warning notice about dev being undertaken on Wordpress 3.9