Implement TreeProcessor to solve some issues with running the suite

- execute beforeAll/afterAll once per suite instead of once per child
  when running focused specs/suites Fixes #773
- refuse to execute an order if it would cause a suite with a beforeAll
  or afterAll to be re-entered after leaving once
- report children of an xdescribe similarly to how they would be
  reported if they were themselves x'd out Fixes #774
- only process the tree once instead of figuring it out again at each
  level

[finishes #87545620]
Fixes #776

src/core/Spec.js

@@ -40,13 +40,13 @@ getJasmineRequireObj().Spec = function(j$) {
     return this.expectationFactory(actual, this);
   };
 
-  Spec.prototype.execute = function(onComplete) {
+  Spec.prototype.execute = function(onComplete, enabled) {
     var self = this;
 
     this.onStart(this);
 
-    if (this.markedPending || this.disabled) {
-      complete();
+    if (!this.isExecutable() || enabled === false) {
+      complete(enabled);
       return;
     }
 
@@ -60,8 +60,8 @@ getJasmineRequireObj().Spec = function(j$) {
       userContext: this.userContext()
     });
 
-    function complete() {
-      self.result.status = self.status();
+    function complete(enabledAgain) {
+      self.result.status = self.status(enabledAgain);
       self.resultCallback(self.result);
 
       if (onComplete) {
@@ -96,8 +96,13 @@ getJasmineRequireObj().Spec = function(j$) {
     }
   };
 
-  Spec.prototype.status = function() {
-    if (this.disabled) {
+  Spec.prototype.getResult = function() {
+    this.result.status = this.status();
+    return this.result;
+  };
+
+  Spec.prototype.status = function(enabled) {
+    if (this.disabled || enabled === false) {
       return 'disabled';
     }