add coverage tools to habitrpg-shared

.gitignore

@@ -1,3 +1,4 @@
+coverage.html
 node_modules
 npm-debug.log
 .idea

package.json

@@ -10,6 +10,7 @@
     "grunt-spritesmith": "~1.22.0"
   },
   "devDependencies": {
+    "coffee-coverage": "~0.4.2",
     "mocha": "*",
     "expect.js": "*",
     "sinon": "~1.8.2",
@@ -21,6 +22,7 @@
     "image-size": "~0.3.2"
   },
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "coverage": "COVERAGE=true mocha --require register-handlers.js --reporter html-cov > coverage.html"
   }
 }

register-handlers.js

@@ -0,0 +1,7 @@
+if(process.env.COVERAGE) {
+    require('coffee-coverage').register({
+        path: 'abbr',
+        basePath: __dirname + '/script',
+        initAll: true,
+    });
+}