Run `appraisal install` to fill in gemfile entries
Run `appraisal install` to fill in gemfile entries

Problem:

Back when we merged documentation into the main repository (cdb1d50),
we added the `markdown-rails` and `redcarpet` gems.

We forgot to run `appraisal install`, so the gems were missing from the
Appraisal gemfiles.

Solution:

Run `appraisal install`.

kpheasey/administrate,nburkley/administrate,dminchev/administrate,TheHumanEffort/administrate,kpheasey/administrate,dminchev/administrate,acrogenesis-lab/administrate,BenMorganIO/administrate,TheHumanEffort/administrate,vgsantoniazzi/administrate,micapam/administrate,nando/administrate,astarix/administrate,thoughtbot/administrate,flama/administrate,flama/administrate,astarix/administrate,micapam/administrate,acrogenesis-lab/administrate,nburkley/administrate,BenMorganIO/administrate,micapam/administrate,thoughtbot/administrate,tmecklem/administrate,nburkley/administrate,joshua5201/administrate,flama/administrate,BenMorganIO/administrate,joshua5201/administrate,vgsantoniazzi/administrate,vgsantoniazzi/administrate,tmecklem/administrate,nando/administrate,nburkley/administrate,vgsantoniazzi/administrate,acrogenesis-lab/administrate,dminchev/administrate,joshua5201/administrate,dminchev/administrate,astarix/administrate,joshua5201/administrate,micapam/administrate,nando/administrate,TheHumanEffort/administrate,nando/administrate,BenMorganIO/administrate,astarix/administrate,tmecklem/administrate,kpheasey/administrate,kpheasey/administrate,thoughtbot/administrate,acrogenesis-lab/administrate,TheHumanEffort/administrate,tmecklem/administrate,thoughtbot/administrate,flama/administrate