Add Travis CI

Author: EvanHahn

.travis.yml

@@ -0,0 +1,4 @@
+language: node_js
+node_js:
+  - "0.10"
+  - "0.11"

README.md

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 Content Security Policy middleware
 ==================================
 
+[![Build Status](https://travis-ci.org/helmetjs/csp.svg?branch=master)](https://travis-ci.org/helmetjs/csp)
+
 Content Security Policy helps prevent unwanted content being injected into your webpages; this can mitigate XSS vulnerabilities, unintended frames, malicious frames, and more. If you want to learn how CSP works, check out the fantastic [HTML5 Rocks guide](http://www.html5rocks.com/en/tutorials/security/content-security-policy/), the [Content Security Policy Reference](http://content-security-policy.com/), and the [Content Security Policy specification](http://www.w3.org/TR/CSP/).
 
 Usage: