fix travis tests 3

.travis.yml

@@ -5,6 +5,8 @@ language: node_js
 node_js:
   - "6"
 before_install:
+  - npm install truffle@3.1.9 -g
   - npm i -g ethereumjs-testrpc
 script:
-  - npm test
+  - testrpc > /dev/null &
+  - truffle test

package.json

@@ -9,7 +9,7 @@
     "babel-preset-stage-3": "^6.17.0",
     "babel-register": "^6.23.0",
     "ethereumjs-testrpc": "^3.0.2",
-    "truffle": "git@github.com:ConsenSys/truffle.git#beta"
+    "truffle": "git@github.com:ConsenSys/truffle.git#3.1.9"
   },
   "scripts": {
     "test": "scripts/test.sh",