Oops, left in some commented-out code.
New test, for when a member registers with an address that we already know about.
Fixed issue in ConfigContext where we'd end up including the database.php config file twice which fails because doing so would define the 'DATABASE_CONFIG' class twice.
Added new step in NavigationContext to register with the e-mail of a member that has already registered.
Added new function to DatabaseContext that will return the e-mail of a member with a certain member status.
Fixed the deliberate error in Registration.feature, we only expect the e-mail to be sent to the member, not the admins.