Lynn Shelton is a curious, Pacific Northwest-bred hybrid of high-concept and low-production value. She has made a specialty out of deconstructing sitcom-y setups: two pals trying to follow through on a dare to make a gay porno (“Humpday”); a man betwixt two interested sisters, one of them a lesbian, in a remote cabin (“Your Sister’s Sister”). Instead of heightening the broad potential of such stories, she plays them naturally, usually with improvised dialogue and an un-stylized, micro-budget intimacy.