Allow forked version of repo to run tests with knapsack_pro gem without

needed API key KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC.

Based on:
https://github.com/KnapsackPro/knapsack_pro-ruby#how-to-make-knapsack_pr
o-works-for-forked-repositories-of-my-project

.travis.yml

@@ -10,7 +10,7 @@ before_script:
   - bundle exec rake db:setup
 script:
   - "bundle exec rake assets:precompile RAILS_ENV=test"
-  - "bundle exec rake knapsack_pro:queue:rspec"
+  - "bin/knapsack_pro_rspec"
 env:
   global:
     - KNAPSACK_PRO_CI_NODE_TOTAL=2

bin/knapsack_pro_rspec

@@ -0,0 +1,9 @@
+#!/bin/bash
+if [ "$KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC" = "" ]; then
+  KNAPSACK_PRO_ENDPOINT=https://api-disabled-for-fork.knapsackpro.com \
+    KNAPSACK_PRO_TEST_SUITE_TOKEN_RSPEC=disabled-for-fork \
+    bundle exec rake knapsack_pro:rspec # use Regular Mode here always
+else
+  # Queue Mode - dynamic tests allocation across CI nodes
+  bundle exec rake knapsack_pro:queue:rspec
+fi