SyncCacheTestCase: fixing some tests
Workers: Avoiding deadlock
Worker: Removing unnecessary import
Releasing 0.9.6
Fixing Reviewer

AttributeError: 'Response' object has no attribute 'from_cache'
Delete zombie workers

Added index for last_ping and removing all transactions
Releasing 0.9.7
Removing transactions from insert_or_update_page

StaleDataError: UPDATE statement on table 'workers' expected
to update 1 row(s); 0 were matched.
Worker: Fixed update_otto_limiter()

NoneType' object has no attribute 'update_domain_definitions'
Materialize data used in /mos-common-violations (re #91)
Set value as prime number (re #88)
Truncate Pages and Domains on tear down their unit
Clear limiters from cache when disabling a domain (Fix #89)
Fixing TestPageHandler

ValueError: badly formed hexadecimal UUID string
Removing remainings transactions
Avoiding to insert duplicate page
Removing old requests (Fix #81)
Support limiter removal (fix #90)