Disable colour output in jenkins script

As it really confuses jenkins

jenkins.sh

@@ -2,6 +2,7 @@
 
 set -e
 
+export KARMAFLAGS="--no-colors"
 export NVM_DIR="/home/jenkins/.nvm"
 [ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"
 nvm use 4

package.json

@@ -18,8 +18,8 @@
     "start": "babel src -w -d lib --source-maps",
     "clean": "rimraf lib",
     "prepublish": "npm run build && git rev-parse HEAD > git-revision.txt",
-    "test": "karma start --browsers PhantomJS",
-    "test-multi": "karma start --single-run=false"
+    "test": "karma start $KARMAFLAGS --browsers PhantomJS",
+    "test-multi": "karma start $KARMAFLAGS --single-run=false"
   },
   "dependencies": {
     "classnames": "^2.1.2",