feat(alerting): renamed AlertRuleModel to just Alert, think making a distinction between an Alert and an Alert Rule is just confusing and was a mistake on my part

feat(alerting): progress on alerting UI and model, refactoring of dashboard parser and tests into extractor component, moved tests from sqlstore to alerting package

Conflicts:
	public/app/plugins/panel/graph/alert_tab_ctrl.ts

Conflicts:
	public/app/plugins/datasource/influxdb/query_part.ts

feat(prometheus): restore old prometheus query editor, revert this commit in prometheus query editor v2 branch

Enable the "limit" param in /api/search