Add build step

Runs all code through babel so I can use the ES2015 prettiness.

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["es2015", "react"]
+}

.gitignore

@@ -1,2 +1,4 @@
 node_modules/
 .DS_Store
+
+dist/

.travis.yml

@@ -0,0 +1,7 @@
+language: node_js
+
+node_js:
+- 4
+- 5
+- 6
+- 7

package.json

@@ -4,7 +4,8 @@
   "description": "Enzyme assertions for mjackson's Expect library",
   "main": "src/index.js",
   "scripts": {
-    "test": "mocha"
+    "test": "mocha",
+    "build": "babel src/ -d dist/"
   },
   "repository": {
     "type": "git",
@@ -22,6 +23,11 @@
   "license": "MIT",
   "author": "Jesse Gibson",
   "dependencies": {
+    "babel-preset-react": "^6.23.0",
     "expect": "^1.20.2"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.23.0",
+    "babel-preset-es2015": "^6.22.0"
   }
 }