added fab.collect, an n-ary app that eats unary apps until it sees co…

…llect.end, at which point it returns an array of apps.

apps/fab.collect.js

@@ -0,0 +1,23 @@
+exports.name      = "fab.collect";
+exports.summary   = "Collects apps until fab.collect.end appears, then returns an app that responds with the apps collected."
+exports.requires  = [ "fab.body" ];
+
+var fab = { body: require( "./fab.body" ).app };
+
+exports.app = ( function() {
+  collect.end = end;
+  return collect;
+
+  function collect( app ) {
+    var apps = [];
+
+    return ( function collect( app ) {
+      return app == end || fab.end
+        ? fab.body( apps )
+        : apps.push( app ) && collect;
+
+    })( app );
+  }
+
+  function end(){}
+})();