add a spec to verify the order of builders
Merge remote-tracking branch 'origin/fix_thread_exhaustion' into fix_builders
Merge branch 'master' of https://github.com/RiotGames/berkshelf-api into fix_builders
build up the cache sequentially when not warmed
Add priority to Worker classes

Worker classes now receive a priority based on their config ordering.
Output the worker's priority to the cache.
Modify cache_manager#diff to take into account priority
  * cache entries should be added when a worker has a
    higher priority than an entry in the cache.
  * cache entries should be removed when a worker has
    the same priority as an entry in the cache
Wrote some tests that ensure this functionality.
sneaky bug with accessing JSON with symbols
indifferently access the cache
something about jdk7, jruby, and celluloid is not good
go back to old travis config
Hash the endpoints of the config
make clear delegated
only save after warmed
use endpoints_checksum to invaslidate cache
Merge pull request #24 from RiotGames/fix_builders

Prioritize items added by specific builders
Cache Builders remove each others additions

Closes #23