Update Gemfile.lock
Replace client_api_key with client_settings hash

So we can pass multiple settings to the client version of the provider
Add settings for host_whitelist and ignored_messages

- host_whitelist is part of rollbar.js
- ignored_messages is in a PR
https://github.com/rollbar/rollbar.js/pull/35
Add spec to verify hostWhiteList is set via config
Add specs to verify ignoredMessages and hostWhiteList
Update rollbar.js snippet
Rename 'client' option to 'client_settings' for clarity
Test for rollbarjs snippet and whitelist separately
Bump version to 1.0.0