[#114] Allowed unconfirmed users to authenticate if :account_activation_required is disabled prior to confirmation.
Ensured that no confirmation emails are sent if :account_activation_required is not true. Adjusted tests.

Added tests for `confirm_email` action.

for registration, authentication, email confirmation, confirmation resending.
Made admin methods create confirmed users.

to `update_media` action. Added controller tests for `upload` and `update_media` actions.
Refactoring.

to allow uploads description (alt text) setting.

test: use private visibility for twitterapi update consistency test, to ensure that a second activity isn't relayed