updates alerts tests
adds delay parameter to alerts
adds attr_reader for raw response on alerts
updates alert class; adds remove_alert and remove_alerts methods
adds new configuration tests
updates alerts tests (fields renaming related)
renames alert property delay to buffer
adds cyclic alerts tests
renaming
Merge pull request #67 from featalion/alerts_tests

Test for IronMQ Alerts, ready to merge
version bump
updated MQ version in Gemfile