Add Jabber Agent
prefer interpolate_jsonpaths over mustache
fix placeholder value
merged master
Moved setting to .env
Merge pull request #301 from afro88/move_timezone_to_env

Moved timezone setting to .env
Merge pull request #258 from mwerner/jabber_agent

Add Jabber Agent
Added liquid templating and migrated first agents
Use liquid in the matches section of EventFormattingAgent
LiquidMigrator is checking for complex JSONPaths

If a complex JSONPath like '$.text[*]' is found the migration will
fail with an exception and keep the database intact
Migrated the PushbulletAgent to use LiquidInterpolatable