Merge pull request #1 from keysen/master

Feature: give access to the instance in .log block
Merge pull request #2 from keysen/master

Fix: broken inheritance between instance
Merge pull request #3 from keysen/master

Fix: Can enable/disable Buchestache middleware
fix: no need to specify the hostname manually as it is set during Logstash transport
gem: bumped buchestache version
fix: version bump
renamed gem to peastash by popular vote
bump gem to v0.0.3
travis: removed ruby-head from test matrix