Allow activation of deactivated lending limits
Abstract the audit method into an AuditableController concern

Use the AuditableController concern in the LendingLimitsController.
Rename PhaseWithLendingLimits to BulkLendingLimits
Select an existing phase instead of creating a new one
Add checkbox to make lending limit active or not

Defaults to active.
Don't show disabled lender's when bulk creating lending limits
Allow creation of SFLG lending limits (without a phase)
Merge pull request #138 from alphagov/bulk-lending-limit-changes

Bulk Lending Limit Changes