spree/spree — pull request #3328 by westonplatter (2013-07-05 22:49:44+00:00)
Title: conditionally load the Rails Engine Rakefile for increased cmd power

For example,

__if no Rakefile detected__,
```shell
rake build
rake common:test_app[user_class]
rake extension:test_app[user_class]
rake install
rake release
rake spec
rake test_app
```

__if Rakefile detected__,
```shell
rake app:about
rake app:assets:clean
rake app:assets:precompile
rake app:clean
rake app:clobber
rake app:db:bootstrap
rake app:db:create
rake app:db:drop
rake app:db:fixtures:load
rake app:db:load_dir[dir]
rake app:db:load_file[file,dir]
rake app:db:migrate
rake app:db:migrate:status
rake app:db:remigrate
rake app:db:rollback
rake app:db:schema:dump
rake app:db:schema:load
rake app:db:seed
rake app:db:setup
rake app:db:structure:dump
rake app:db:version
rake app:deface:clean
rake app:deface:get_result[virtual_path]
rake app:deface:precompile
rake app:deface:test_selector[virtual_path,selector]
rake app:doc:app
rake app:log:clear
rake app:middleware
rake app:notes
rake app:notes:custom
rake app:paperclip:clean
rake app:paperclip:refresh
rake app:paperclip:refresh:metadata
rake app:paperclip:refresh:missing_styles
rake app:paperclip:refresh:thumbnails
rake app:rails:template
rake app:rails:update
rake app:routes
rake app:secret
rake app:simplecov
rake app:spec
rake app:spec:models
rake app:spree:install:migrations
rake app:spree:reset_taxon_permalinks
rake app:spree_api:install:migrations
rake app:spree_auth:admin:create
rake app:spree_auth:install:migrations
rake app:spree_extension_name:install:migrations
rake app:state_machine:draw
rake app:stats
rake app:test
rake app:test:recent
rake app:test:single
rake app:test:uncommitted
rake app:time:zones:all
rake app:tmp:clear
rake app:tmp:create
rake build
rake common:test_app[user_class]
rake db:create
rake db:drop
rake db:fixtures:load
rake db:migrate
rake db:migrate:status
rake db:rollback
rake db:schema:dump
rake db:schema:load
rake db:seed
rake db:setup
rake db:structure:dump
rake db:version
rake extension:test_app[user_class]
rake install
rake release
rake spec
rake test_app
```