Send stacktraces to lager as formatted strings.
Make multiline stack traces configurable.
Add multilines_stack_traces section to config skel.
Merge branch 'master' of https://github.com/ChicagoBoss/ChicagoBoss into format_stacktraces_in_logs

* 'master' of https://github.com/ChicagoBoss/ChicagoBoss:
  Send a server error (500) when an action fails.
  Support specs with Module:Type().
  Document template_auto_escape.
  be abble to send a json response with a 404 handler

Conflicts:
	src/boss/boss_web_controller.erl
Rename multiline_stack_traces to log_stack_multiline.
Move Class and Error to common stacktrace formatting function.
Merge pull request #517 from fdevibe/format_stacktraces_in_logs

Format stacktraces in logs