Use DockerWorker test environment by default
Bug 1076686 - Gzip backing log files saves us money + workaround treeherder log parsing.
Merge pull request #48 from lightsofapollo/bug-1076686

Bug 1076686 - Gzip backing log files saves us money + workaround treeherder log parsing
Volume caching
Added stats
Added schema definition for cache
Added documentation to the volume cache manager
Fixed stats for tests
removed unecessary test file
Fixed payload schema
Added scope checking for volume caches
Added GC for volume caches
Fixed indentation
Adjusted stat names for cache hit/miss
Added generator support for volume cache