Add lint support.

Author: mhfrantz

Diff for: .jshintrc

@@ -0,0 +1,16 @@
+// .jshintrc
+// Global configuration defaults for the jshint tool.
+{
+  "node": true,
+  "globalstrict": false,
+  "indent": 2,
+  "expr": true,
+  "globals": {
+    "expect": true,
+    "describe": true,
+    "it": true,
+    "xit": true,
+    "before": true,
+    "after": true
+  }
+}

Diff for: package.json

@@ -7,6 +7,7 @@
     "test": "test"
   },
   "scripts": {
+    "lint": "jshint lib test",
     "test": "mocha"
   },
   "repository": {
@@ -30,6 +31,7 @@
   "homepage": "https://github.com/mhfrantz/gremlin-graphviz",
   "devDependencies": {
     "gremlin-v3": "0.0.2",
+    "jshint": "^2.5.10",
     "mocha": "^2.0.1"
   }
 }