created account-scaffold
corrected association of Account
added login function to accounts_controller
migrated database
added accounts-migration
migrated test-database
removed functional tests which relied on inaccessible fields
created test-mockups for the login
Merge branch 'deployment' into login
Merge branch 'login' into iss24
removed unnecessary methods
added login/logout-routes
removed account-model
changed notation from user.isAdmin to the rubyist is_admin
wrote changes to user-model into the er-diagram & the shell-script
removed functional tests of the account-controller

functional-tests will be added again, when login/logout-procedure is
implemented. scaffolded functional-tests were inapplicable due to
removal of the account-model
Merge branch 'iss24'