Add code coverage with Istanbul

.gitignore

@@ -1,9 +1,10 @@
 .DS_Store
 .sass-cache
 node_modules
+coverage
 dist
 .zip
 maildev-*
 settings.json
 *.sublime-*
-.nodemonignore
+.nodemonignore

package.json

@@ -20,6 +20,9 @@
     "type": "git",
     "url": "http://github.com/djfarrelly/maildev.git"
   },
+  "scripts": {
+    "test": "./node_modules/.bin/istanbul cover _mocha"
+  },
   "main": "./index.js",
   "bin": {
     "maildev": "./bin/maildev"
@@ -45,15 +48,13 @@
     "grunt-nodemon": "^0.4.0",
     "grunt-sass": "^1.1.0",
     "http-proxy-middleware": "^0.12.0",
+    "istanbul": "^0.4.4",
     "matchdep": "^1.0.1",
     "mocha": "^2.2.5",
     "nodemailer": "^2.3.0",
     "request": "^2.69.0"
   },
   "engines": {
     "node": ">=0.10.0"
-  },
-  "scripts": {
-    "test": "./node_modules/mocha/bin/mocha"
   }
 }

test/email.js

@@ -47,7 +47,7 @@ describe('email', function() {
 
         assert.equal(html, '<img src="/email/' + email.id + '/attachment/tyler.jpg"/>');
 
-        // Pass baseUrl 
+        // Pass baseUrl
         maildev.getEmailHTML(email.id, 'localhost:8080', function(err, html) {
 
           assert.equal(html, '<img src="//localhost:8080/email/' + email.id + '/attachment/tyler.jpg"/>');