chore(travis): don't call grunt:package for unit tests

Author: Narretz

scripts/travis/before_build.sh

@@ -11,8 +11,11 @@ fi
 
 npm install -g grunt-cli
 
-if [ $JOB != "ci-checks" ]; then
-  grunt package
+if [ $JOB != "ci-checks"]; then
+  if [ $JOB != "unit" ]; then
+    # unit tests test against unminified code
+    grunt package
+  fi
   echo "wait_for_browser_provider"
   ./scripts/travis/wait_for_browser_provider.sh
 fi