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The command ‘rails console —sandbox’ loads our Rails application,
connects to the database and automatically starts a database
transaction. All database operations performed within this console
session are rolled back upon leaving the console. Reference -
https://www.codeschool.com/blog/2014/06/17/rails-console-sandbox/

Changes precedence of the conditional clause, more recent versions come
first now. Fixes problems when users update their app and still have
the old rails files inside of their file tree.
Closes #2405 - check the discussion there for further info.

It migrates the DB and prepares the test DB.

Quite often, db:test:prepare is run after db:migrate.
Added for convenience.

Reorganizing plugins so that each plugin has it's own directory now so that any plugin-specific functions can be bundled within there.