refactor: add start script to run the example easily

Author: sayanee

package.json

@@ -1,12 +1,18 @@
 {
   "name": "angular-pdf",
   "version": "1.2.8",
+  "main": "dist/angular-pdf.js",
   "author": "Sayanee <[email protected]>",
   "description": "An Angularjs directive <ng-pdf> to display PDF in the browser with PDFJS.",
   "repository": {
     "type": "git",
     "url": "https://github.com/sayanee/angular-pdf.git"
   },
+  "keywords": [
+    "pdf",
+    "angular",
+    "directive"
+  ],
   "license": "MIT",
   "devDependencies": {
     "grunt": "0.4.5",
@@ -19,6 +25,7 @@
     "grunt-jscs": "2.5.0",
     "grunt-jsonlint": "1.0.6",
     "grunt-karma": "^0.12.1",
+    "http-server": "^0.8.5",
     "jasmine-core": "^2.4.1",
     "karma": "^0.13.15",
     "karma-jasmine": "^0.3.6",
@@ -27,7 +34,8 @@
     "phantomjs": "^1.9.19"
   },
   "scripts": {
-    "test": "grunt --verbose",
-    "build": "grunt"
+    "build": "grunt",
+    "start": "http-server ./example -p 8081",
+    "test": "grunt --verbose"
   }
 }