Add/fix comments. Add jshintrc and editorconfig

.editorconfig

@@ -0,0 +1,6 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+end_of_line = LF

.jshintrc

@@ -0,0 +1,29 @@
+{
+	"browser": true,
+	"node": true,
+	"es5": true,
+
+	"predef": [
+        "define",
+        "setImmediate"
+    ],
+
+	"boss": true,
+	"curly": true,
+	"eqnull": true,
+	"expr": true,
+	"globalstrict": false,
+	"laxbreak": true,
+	"newcap": true,
+	"noarg": true,
+	"noempty": true,
+	"nonew": true,
+	"quotmark": "single",
+	"strict": false,
+	"trailing": true,
+	"undef": true,
+	"unused": true,
+
+	"maxdepth": 3,
+	"maxcomplexity": 4
+}

avow.js

@@ -1,5 +1,4 @@
 /* Copyright (c) 2012 Brian Cavalier */
-/*global define:true, setImmediate:true*/
 (function(define) {
 define(function() {
 
@@ -104,6 +103,7 @@ define(function() {
 
 			// When the promise is fulfilled or rejected, call all pending handlers
 			function applyAllPending(apply, value) {
+				// Already fulfilled or rejected, ignore silently
 				if(!pending) {
 					return;
 				}
@@ -128,12 +128,12 @@ define(function() {
 			}
 		}
 
-		// Call fulfilled handler and fulfill the next promise in the chain
+		// Call fulfilled handler and forward to the next promise in the chain
 		function applyFulfill(val, onFulfilled, _, fulfillNext, rejectNext) {
 			return apply(val, onFulfilled, fulfillNext, fulfillNext, rejectNext);
 		}
 
-		// Call rejected handler and fulfill the next promise in the chain
+		// Call rejected handler and forward to the next promise in the chain
 		function applyReject(val, _, onRejected, fulfillNext, rejectNext) {
 			return apply(val, onRejected, rejectNext, fulfillNext, rejectNext);
 		}