Correct references to spree_auth_devise in spree_cmd/installer and sanbdox script

Author: radar

cmd/lib/spree_cmd/installer.rb

@@ -98,7 +98,7 @@ def add_gems
         end
 
         if @install_default_auth
-          gem :spree_auth_devise, :github => "spree/spree_auth_devise", :branch => "edge"
+          gem :spree_auth_devise, :github => "spree/spree_auth_devise"
         end
 
         run 'bundle install', :capture => true

lib/sandbox.sh

@@ -10,7 +10,7 @@ fi
 
 cd ./sandbox
 echo "gem 'spree', :path => '..'" >> Gemfile
-echo "gem 'spree_auth_devise', :github => 'spree/spree_auth_devise', :branch => 'edge'" >> Gemfile
+echo "gem 'spree_auth_devise', :github => 'spree/spree_auth_devise'" >> Gemfile
 
 bundle install --gemfile Gemfile
 bundle exec rails g spree:install --auto-accept --user_class=Spree::User