Ensure running 'bundle exec' before 'rake'

bf4 · bf4 · commit 2400f78e571f · 2016-03-13T00:27:40.000-06:00
diff --git a/Rakefile b/Rakefile
@@ -3,6 +3,8 @@ begin
 rescue LoadError
 end
 
+require 'bundler'
+Bundler.setup
 require 'bundler/gem_tasks'
 
 begin
