Let job classes optionally define retryable exceptions
Add mixin for making jobs retryable for certain exceptions.
Simplify retryable exception logic
Move files from bin to exe.

I want to be able to use bin for bundler's binstubs.
Ignore bundler binstubs.
Add .rspec defaults.
Add pause/unpause support.
Implement integration test for retrying expected failures
Merge pull request #63 from seomoz/retry_exceptions

Add support for retryable errors through Qless::RetryExceptions mixin.
Update qless-core.
Merge pull request #64 from seomoz/pause_workers

Pause workers
upgrade to redis 3.0+
make the redis-rb 3.0 upgrade backwards compatible back to redis-rb 2.2
turn use_legacy_evalsha into a constant
Merge pull request #36 from seomoz/redis-3.0-upgrade

upgrade to redis 3.0+
Use the version constant rather than rubygems to get the version.

Gem.loaded_specs['redis'] was returning nil when using bundler's
standalone mode (which avoids using rubygems at runtime).
Fix the path used by the travis build script.
Update rake to latest.
Report which keys were found.
Use the configured redis connection string for this spec.