trim whitespace from ends of comment content. fixes acegiak/Semantic-Linkbacks#5
trim whitespace from ends of comment content. fixes acegiak/Semantic-Linkbacks#5

dshanske/wordpress-semantic-linkbacks,dshanske/wordpress-semantic-linkbacks,dshanske/wordpress-semantic-linkbacks,pfefferle/wordpress-semantic-linkbacks,acegiak/Semantic-Linkbacks,pfefferle/wordpress-semantic-linkbacks,pfefferle/wordpress-semantic-linkbacks,dshanske/wordpress-semantic-linkbacks,acegiak/Semantic-Linkbacks,pfefferle/wordpress-semantic-linkbacks