Filterable widget posts rendering#29

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sternb0t wants to merge 3 commits intoAutomattic:developfrom

sternb0t:master

Commits on Apr 23, 2015

extendable fn to override zone post widget rendering
sternb0t
committed

Commits on Apr 24, 2015

apply filters for 'widget_zone_posts_renderer' if any
sternb0t
committed

Commits on Apr 27, 2015

avoid echo in filter function; expect returned html instead
sternb0t
committed