adding guard in Rakefile to automatically install Fixjour
adding guard in Rakefile to automatically install Fixjour

This commit is largely for RunCodeRun so it can (hopefully) run the rake
task now.

salimane/email-spec,collectiveidea/email-spec,email-spec/email-spec,collectiveidea/email-spec,andrewvc/email-spec,woahdae/email-spec,agibralter/email-spec,hashrocket/email-spec,kathyonu/email-spec,dcrec1/email-spec,agibralter/email-spec,ivanoats/email-spec,dcrec1/email-spec,spraints/email-spec,tibastral/email-spec,change/email-spec,bmabey/email-spec,spraints/email-spec,hashrocket/email-spec,kathyonu/email-spec,jalevin/email-spec,timcharper/email-spec,lencioni/email-spec,ivanoats/email-spec,lencioni/email-spec,timcharper/email-spec,tibastral/email-spec,andrewvc/email-spec,jalevin/email-spec,woahdae/email-spec,salimane/email-spec,change/email-spec