Remove hashrockets from README examples
Add instrument_action helper support
Auto-include controller helpers during initialization
Add documentation for instrument_action; fix old metrics references
Support list-style args for instrument_action
Add docs for list style
Tolerate variable query numbers in rails 4.1
Don't freeze since it isn't faster
Handle nil state
Fix poor action name
Merge pull request #85 from librato/feature/instrument_action

Feature/instrument action