Require `active_support` in fast_spec_helper
Require `active_support` in fast_spec_helper

This prevents the following error when running the tests.

```
.../activesupport-4.1.5/lib/active_support/number_helper.rb:3:in `<module:NumberHelper>': uninitialized constant ActiveSupport::Autoload (NameError)
   ...
   from .../activesupport-4.1.5/lib/active_support/core_ext.rb:1:in `<top (required)>'
   from .../spec/fast_spec_helper.rb:6:in `require'
```

See also: <https://github.com/rails/rails/issues/14664>.

orangeiceberg/hound,jmcarp/hound,alexeyzab/hound,enricogenauck/labhound,e-sabelhaus/gitlab-doge,cbeer/hound,hashbangnz/hound,enricogenauck/labhound,tinfoil/hound,thoughtbot/hound,Rademade/reviewer,houndci/hound,viniciustorves/hound,Reprazent/hound,JuanitoFatas/hound,eliperkins/hound,jmcarp/hound,brgaulin/hound,timchunght/hound,bitjourney/hound,larrylv/hound,brgaulin/hound,yatish27/hound,platanus/hound,sbalay/hound,peritpatrio/hound,Rademade/reviewer,makersacademy/hound,sharma1nitish/hound,wyncode/hound,hashbangnz/hound,peritpatrio/hound,teambox/hound,daniel-beard/hound,dobtco/hound,thoughtbot/hound,wiserfirst/hound,Koronen/hound,Reprazent/hound,e-sabelhaus/gitlab-doge,dobtco/hound,houndci/hound,bronislav/hound,JuanitoFatas/hound,yatish27/hound,degica/hound,jeanmatheussouto/hound,brgaulin/hound,e-sabelhaus/gitlab-doge,sbalay/hound,makersacademy/hound,JuanitoFatas/hound,mynewsdesk/hound,peritpatrio/hound,wiserfirst/hound,degica/hound,jeanmatheussouto/hound,bronislav/hound,q-centrix/hound,teambox/hound,enricogenauck/labhound,daniel-beard/hound,e-sabelhaus/gitlab-doge,jdrew1303/hound,eliperkins/hound,viniciustorves/hound,thoughtbot/hound,Koronen/hound,larrylv/hound-gitlab,bitjourney/hound,wyncode/hound,makersacademy/hound,fukayatsu/hound,larrylv/hound-gitlab,hashbangnz/hound,Rademade/reviewer,yatish27/hound,orangeiceberg/hound,wyncode/hound,jmcarp/hound,alexeyzab/hound,bitjourney/hound,rakibulislam/hound,peritpatrio/hound,wiserfirst/hound,wadetandy/hound,bitjourney/hound,sharma1nitish/hound,teambox/hound,mydummyaccount3737/hound,rgp/hound,timoschilling/hound,daniel-beard/hound,mydummyaccount3737/hound,brgaulin/hound,rgp/hound,platanus/hound,kolosek/hound,wyncode/hound,mynewsdesk/hound,timchunght/hound,rgp/hound,wadetandy/hound,cbeer/hound,timoschilling/hound,cbeer/hound,dobtco/hound,eliperkins/hound,jdrew1303/hound,houndci/hound,enricogenauck/labhound,houndci/hound,timchunght/hound,q-centrix/hound,thoughtbot/hound,teambox/hound,tinfoil/hound,jmcarp/hound,cbeer/hound,mynewsdesk/hound,mydummyaccount3737/hound,yatish27/hound,wiserfirst/hound,q-centrix/hound,larrylv/hound,q-centrix/hound,rgp/hound,kolosek/hound,timoschilling/hound,adriagalin/hound,sbalay/hound,orangeiceberg/hound,dobtco/hound,platanus/hound,larrylv/hound-gitlab,timoschilling/hound,daniel-beard/hound,wadetandy/hound,fukayatsu/hound,makersacademy/hound,fukayatsu/hound,jdrew1303/hound,sharma1nitish/hound,wadetandy/hound,adriagalin/hound,mynewsdesk/hound,mydummyaccount3737/hound,alexeyzab/hound,degica/hound,jeanmatheussouto/hound,rakibulislam/hound,Reprazent/hound,platanus/hound,Koronen/hound,rakibulislam/hound,eliperkins/hound,kolosek/hound,viniciustorves/hound,tinfoil/hound,Rademade/reviewer,adriagalin/hound,adriagalin/hound,bronislav/hound,JuanitoFatas/hound,tinfoil/hound,larrylv/hound,viniciustorves/hound,alexeyzab/hound,orangeiceberg/hound,jeanmatheussouto/hound,sbalay/hound,hashbangnz/hound,Koronen/hound,fukayatsu/hound,kolosek/hound,timchunght/hound,Reprazent/hound,bronislav/hound,sharma1nitish/hound