add keep_events_for as an optional field for agents to decide how long to store events
fix spec?
typo
add validation and updating of existing event's expires_at values
Merge remote-tracking branch 'origin/master' into add_keep_events_for_to_agents

Conflicts:
	CHANGES.md
	app/models/agent.rb
fix specs
remove duplicate method
add note about emails
Merge branch 'master' of github.com:cantino/huginn
Merge branch 'master' into add_keep_events_for_to_agents
update Agent#events_count when events are expired
Merge pull request #118 from cantino/add_keep_events_for_to_agents

Allow agents to determine how long to keep events for
Quick'n'dirty patch to address touchscreen issues

The code taken from here:

https://github.com/twbs/bootstrap/pull/5067#issuecomment-8604323
add documentation
Merge pull request #124 from KenYN/patch-1

Quick'n'dirty patch to address touchscreen issues
comment on touchstart.dropdown e.stopPropagation
Update .env.example