allow documentation to be in external file

* Load templates once instead of per request
* show timing information
* load files ending in .ngdoc and process them

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+@workInProgress
+@ngdoc overview
+@name angular.validator
+@namespace Namespace for all filters.
+@description
+# Overview
+Validators are a standard way to check the user input against a specific criteria. For 
+example, you might need to check that an input field contains a well-formed phone number.
+
+# Syntax
+Attach a validator on user input widgets using the `ng:validate` attribute.
+
+<doc:example>
+  <doc:source>
+    Change me: &lt;input type="text" name="number" ng:validate="integer" value="123"&gt;
+  </doc:source>
+  <doc:scenario>
+    it('should validate the default number string', function() {
+      expect(element('input[name=number]').attr('class')).
+         not().toMatch(/ng-validation-error/);
+    });
+    it('should not validate "foo"', function() {
+      input('number').enter('foo');
+      expect(element('input[name=number]').attr('class')).
+         toMatch(/ng-validation-error/);
+    });
+  </doc:scenario>
+</doc:example>
+
+
+# Writing your own Validators
+Writing your own validator is easy. To make a function available as a 
+validator, just define the JavaScript function on the `angular.validator` 
+object. <angular/> passes in the input to validate as the first argument 
+to your function. Any additional validator arguments are passed in as 
+additional arguments to your function.
+
+You can use these variables in the function:
+
+* `this` — The current scope.
+* `this.$element` — The DOM element containing the binding. This allows the filter to manipulate
+  the DOM in addition to transforming the input.
+  
+In this example we have written a upsTrackingNo validator. 
+It marks the input text "valid" only when the user enters a well-formed 
+UPS tracking number.
+
+@css ng-validation-error
+  When validation fails, this css class is applied to the binding, making its borders red by
+  default.
+
+@example
+<script>
+ angular.validator('upsTrackingNo', function(input, format) {
+   var regexp = new RegExp("^" + format.replace(/9/g, '\\d') + "$");
+   return input.match(regexp)?"":"The format must match " + format;
+ });
+</script>
+<input type="text" name="trackNo" size="40"
+      ng:validate="upsTrackingNo:'1Z 999 999 99 9999 999 9'" 
+      value="1Z 123 456 78 9012 345 6"/>
+
+@scenario
+it('should validate correct UPS tracking number', function() {
+  expect(element('input[name=trackNo]').attr('class')).
+     not().toMatch(/ng-validation-error/);
+});
+
+it('should not validate in correct UPS tracking number', function() {
+  input('trackNo').enter('foo');
+  expect(element('input[name=trackNo]').attr('class')).
+     toMatch(/ng-validation-error/);
+});