docs(guide/overview): Refactor overview and mvc docs

Before, there we multiple overview docs:
- guide/overview
- guide/introduction
- guide/dev_guide.mvc
- guide/dev_guide.mvc.understanding_model
- guide/dev_guide.mvc.understanding_view
- guide/concepts

Now we have:
- guide/introduction: High level description of Angular with the key benefits but without code or any concrete concepts
- guide/concepts: explains all important concepts with a simple example and contains deep links to the other parts of the guide.

 All the old information was moved into existing documents or deleted when they were duplicates.

docs/components/angular-bootstrap/bootstrap-prettify.js

@@ -169,21 +169,23 @@ directive.ngSetHtml = ['getEmbeddedTemplate', function(getEmbeddedTemplate) {
 directive.ngEvalJavascript = ['getEmbeddedTemplate', function(getEmbeddedTemplate) {
   return {
     compile: function (element, attr) {
-      var script = getEmbeddedTemplate(attr.ngEvalJavascript);
-
-      try {
-        if (window.execScript) { // IE
-          window.execScript(script || '""'); // IE complains when evaling empty string
-        } else {
-          window.eval(script);
+      var fileNames = attr.ngEvalJavascript.split(' ');
+      angular.forEach(fileNames, function(fileName) {
+        var script = getEmbeddedTemplate(fileName);
+        try {
+          if (window.execScript) { // IE
+            window.execScript(script || '""'); // IE complains when evaling empty string
+          } else {
+            window.eval(script + '//@ sourceURL=' + fileName);
+          }
+        } catch (e) {
+          if (window.console) {
+            window.console.log(script, '\n', e);
+          } else {
+            window.alert(e);
+          }
         }
-      } catch (e) {
-        if (window.console) {
-          window.console.log(script, '\n', e);
-        } else {
-          window.alert(e);
-        }
-      }
+      });
     }
   };
 }];