Implements new admin menu structure #304

close #305
Provide a helper to point to sign up/in for different configs
Implements piwik tracking
Merge pull request #504 from ChrisBr/menu

Implements new admin menu structure #304
Moves sponsor email attribute from conference to contact
Merge pull request #503 from ChrisBr/move_sponsor_email

Moves sponsor email attribute from conference to contact
Refactoring rooms
Test for ichain authentication
Merge pull request #515 from ChrisBr/rooms

Refactoring admin room menu
Merge pull request #530 from ChrisBr/devise

Implements test for ichain authentication
Merge pull request #538 from hennevogel/master

Implements piwik tracking
Add clarification when updating user's email
not using real emails/domains in tests
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