Support whitelisting subnets in Rack_Attack
Description
Some users may need to whitelist a range of IPs and white blocking a single IP won't help.
Proposal
Add a setting to support whitelisting subnets
Links / references
https://github.com/kickstarter/rack-attack/issues/98#issuecomment-59603339
Feature checklist
Make sure these are completed before closing the issue, with a link to the relevant commit.
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Feature assurance -
Documentation -
Added to features.yml