Added tests for `confirm_email` action.

unless requested by admin or moderator.

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

[#114] Account confirmation email, registration as unconfirmed (config-based), auth prevention for unconfirmed.

[#114] Refactored `password_reset` (moved to TwitterAPI). Added homepage links to password reset result pages.

Refactoring.

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

to allow uploads description (alt text) setting.