Loosen FCP restrictions

Allows an item to enter FCP when a majority of team members has approved
and *no* team member has objected. This retains the consensus process,
but makes it so that FCP isn't blocked *by default*. Rather, members who
object to the proposal need to register a concern to block it.

src/github/nag.rs

@@ -224,6 +224,7 @@ fn evaluate_nags() -> DashResult<()> {
         };
 
         let num_active_reviews = reviews.iter().filter(|&&(_, ref r)| !r.reviewed).count();
+        let num_complete_reviews = reviews.len() - num_active_reviews;
         let num_active_concerns = concerns
             .iter()
             .filter(|&&(_, ref c)| c.fk_resolved_comment.is_none())
@@ -255,7 +256,7 @@ fn evaluate_nags() -> DashResult<()> {
             };
         }
 
-        if num_active_reviews == 0 && num_active_concerns == 0 {
+        if (num_active_reviews < num_complete_reviews) && num_active_concerns == 0 {
             // TODO only record the fcp as started if we know that we successfully commented
             // i.e. either the comment claims to have posted, or we get a comment back to reconcile