add Travis

.travis.yml

@@ -0,0 +1,15 @@
+language: node_js
+node_js: node
+
+install: npm install
+
+script:
+  - npm run clean
+  - npm run build
+
+cache:
+  directories:
+    - node_modules
+  
+notifications:
+    email: false

README.md

@@ -10,6 +10,7 @@ Some naive helpers to get you on your way to making some transactions, if you'd
 Aimed to support usage in browsers or node and ES∞+, so
 you'll probably need a babel here and a bundler there (or use [one of the built versions](./dist)),
 of which I expect you'll know quite well ([otherwise, go check out js-reactor](https://github.com/bigchaindb/js-reactor)).
+[![Build Status](https://travis-ci.org/bigchaindb/js-bigchaindb-driver.svg?branch=master)](https://travis-ci.org/bigchaindb/js-bigchaindb-driver)
 
 ## Compatibility