Now workers will to delete older requests
Remove older requests: Avoiding unnecessary query
Fixed TestDomainCanonicalizationValidator
Change last requests in last day to lastest failed requests (fix #114)
DomainTopCategoryViolationsHandler: Changing violations params

Added key name in violations list
Removing unused import

my bad =/
Removing dead code

my bad =/
Adds domain_name to reviews data on ViolationHandler (fix #116)
Release 0.12.0
Releasing 0.12.1

Removing unnecessary files; my bad.