Confirmation email now changes according to the require_admin_approval option.

refs #1322
Strings are now get via locales using I18n.
Tests are still missing.

refs #1322
Attempt to test the confirmation email features.

refs #1322 and refs #1321
Merge branch 'branch-v2-1322-bug-confirmation-email-admin-approval' of git://github.com/gmiotto/mconf-web into gmiotto-branch-v2-1322-bug-confirmation-email-admin-approval
Tests for confirmation email, with changes in the test suite for it

A continuation of 5125f60.
Had to make some changes in the test suite to be able to send and test emails
with devise and resque.
Disabled use_transactional_fixtures and started using DatabaseCleaner to
clean up the test database. Most of the times it will still use transactions,
but it can be changed to truncation if we need it.

refs #1322
Removed unused constants and block from seeds

The config file is loaded by configatron (config/configatron/default.rb).
These constants were throwing warnings for being loaded multiple times.
Ignore capybara's html file created by show_page
Merge PR #27 of miotto/branch-v2-1322-bug-confirmation-email-admin-approval into branch-v2