feat(pkg.json): add es5 config to run demos in IE

Author: jackofdiamond5

angular.json

@@ -70,6 +70,9 @@
                   "with": "src/environments/environment.hmr.ts"
                 }
               ]
+            },
+            "es5": {
+              "tsConfig": "src/tsconfig-es5.app.json"
             }
           }
         },
@@ -86,6 +89,9 @@
               "hmr": true,
               "hmrWarning": false,
               "browserTarget": "igniteui-dev-demos:build:hmr"
+            },
+            "es5": {
+              "browserTarget": "igniteui-dev-demos:build:es5"
             }
           }
         },

package.json

@@ -4,6 +4,7 @@
   "scripts": {
     "ng": "ng",
     "start": "ng serve --open --configuration hmr",
+    "start-es5": "ng serve --configuration es5 -o",
     "build": "ng build",
     "test": "ng test",
     "lint": "ng lint",

src/tsconfig-es5.app.json

@@ -0,0 +1,6 @@
+{
+    "extends": "./tsconfig.app.json",
+    "compilerOptions": {
+        "target": "es5"
+    }
+}